/*****************************************************************************
 *
 *	 f8.c
 *	 Portable F8 emulator (Fairchild 3850)
 *
 *	 Copyright (c) 2000 Juergen Buchmueller, all rights reserved.
 *
 *	 - This source code is released as freeware for non-commercial purposes.
 *	 - You are free to use and redistribute this code in modified or
 *	   unmodified form, provided you list me in the credits.
 *	 - If you modify this source code, you must add a notice to each modified
 *	   source file that it has been changed.  If you're a nice person, you
 *	   will clearly mark each change too.  :)
 *	 - If you wish to use this for commercial purposes, please contact me at
 *	   pullmoll@t-online.de
 *	 - The author of this copywritten work reserves the right to change the
 *     terms of its usage and license at any time, including retroactively
 *   - This entire notice must remain in the source code.
 *
 *	This work is based on Frank Palazzolo's F8 emulation in a standalone
 *	Fairchild Channel F emulator and the 'Fairchild F3850 CPU' data sheets.
 *
 *****************************************************************************/

/* PeT 25.June 2001
   added interrupt functionality
 */

#include <stdio.h>
#include "driver.h"
#include "state.h"
#include "mamedbg.h"
#include "f8.h"

#define S	0x01
#define C	0x02
#define Z	0x04
#define O	0x08
#define I	0x10

#define cS  4
#define cL	6

typedef struct {
	UINT16	pc0;	/* program counter 0 */
	UINT16	pc1;	/* program counter 1 */
	UINT16	dc0;	/* data counter 0 */
	UINT16	dc1;	/* data counter 1 */
	UINT8	a;		/* accumulator */
	UINT8	w;		/* processor status */
	UINT8	is; 	/* scratchpad pointer */
	UINT8	dbus;	/* data bus value */
	UINT16	io; 	/* last I/O address */
    UINT16  irq_vector;
	int 	(*irq_callback)(int irqline);
    UINT8   r[64];  /* scratchpad RAM */
    int     irq_request;
}	f8_Regs;

int f8_icount;

static f8_Regs f8;

/* timer shifter polynome values (will be used for timer interrupts) */
static UINT8 timer_shifter[256];

/* clear all flags */
#define CLR_OZCS                \
	f8.w &= ~(O|Z|C|S)

/* set sign and zero flags (note: the S flag is complementary) */
#define SET_SZ(n)               \
	if (n == 0) 				\
		f8.w |= Z | S;			\
	else						\
	if (n < 128)				\
		f8.w |= S

/* set overflow and carry flags */
#define SET_OC(n,m)             \
	if (n + m > 255)			\
		f8.w |= C;				\
	if ((n&127)+(m&127) > 127)	\
	{							\
		if (!(f8.w & C))		\
			f8.w |= O;			\
	}							\
	else						\
	{							\
		if (f8.w & C)			\
			f8.w |= O;			\
	}

/* Layout of the registers in the debugger */
static UINT8 f8_reg_layout[] = {
	F8_PC0, F8_PC1, F8_DC0, F8_DC1, F8_W, F8_A, F8_IS, -1,
        F8_J, F8_HU, F8_HL, F8_KU, F8_KL, F8_QU, F8_QL, -1,
        F8_R0, F8_R1, F8_R2, F8_R3, F8_R4, F8_R5, F8_R6, F8_R7, F8_R8, -1,
        F8_R16, F8_R17, F8_R18, F8_R19, F8_R20, F8_R21, F8_R22, F8_R23, -1,
        F8_R24, F8_R25, F8_R26, F8_R27, F8_R28, F8_R29, F8_R30, F8_R31, -1,
        F8_R32, F8_R33, F8_R34, F8_R35, F8_R36, F8_R37, F8_R38, F8_R39, -1,
        F8_R40, F8_R41, F8_R42, F8_R43, F8_R44, F8_R45, F8_R46, F8_R47, -1,
        F8_R48, F8_R49, F8_R50, F8_R51, F8_R52, F8_R53, F8_R54, F8_R55, -1,
        F8_R56, F8_R57, F8_R58, F8_R59, F8_R60, F8_R61, F8_R62, F8_R63, 0
};

/* Layout of the debugger windows x,y,w,h */
static UINT8 f8_win_layout[] = {
	 0, 0,80, 2,	/* register window (top rows) */
	 0, 3,24,19,	/* disassembler window (left colums) */
	25, 3,55, 9,	/* memory #1 window (right, upper middle) */
	25,13,55, 9,	/* memory #2 window (right, lower middle) */
     0,23,80, 1,    /* command line window (bottom rows) */
};

/******************************************************************************
 * ROMC (ROM cycles)
 * This is what the Fairchild F8 CPUs use instead of an address bus
 * There are 5 control lines and each combination of those lines has
 * a special meaning. The devices attached to those control lines all
 * have their own program counters (PC0 and PC1) and at least one
 * data counter (DC0).
 * Currently the emulation does not handle distinct PCs and DCs, but
 * only one instance inside the CPU context.
 ******************************************************************************/
static void ROMC_00(int insttim)	/* SKR - added parameter to tell if  */
                                    /* it is long or short based on inst */
{
    /*
     * Instruction Fetch. The device whose address space includes the
     * contents of the PC0 register must place on the data bus the op
     * code addressed by PC0; then all devices increment the contents
     * of PC0.
     */

	f8.dbus = cpu_readop(f8.pc0);
    f8.pc0 += 1;
    f8_icount -= insttim;	/* SKR - ROMC00 is usually short, not short+long, */
                            /* but DS is long */
}

static void ROMC_01(void)
{
    /*
     * The device whose address space includes the contents of the PC0
     * register must place on the data bus the contents of the memory
     * location addressed by PC0; then all devices add the 8-bit value
     * on the data bus as signed binary number to PC0.
     */
	f8.dbus = cpu_readop_arg(f8.pc0);
	f8.pc0 += (INT8)f8.dbus;
    f8_icount -= cL;
}

static void ROMC_02(void)
{
    /*
     * The device whose DC0 addresses a memory word within the address
     * space of that device must place on the data bus the contents of
     * the memory location addressed by DC0; then all devices increment
     * DC0.
     */
    f8.dbus = program_read_byte_8(f8.dc0);
    f8.dc0 += 1;
    f8_icount -= cL;
}

static void ROMC_03(int insttim)	/* SKR - added parameter to tell if  */
{                                   /* it is long or short based on inst */
    /*
     * Similiar to 0x00, except that it is used for immediate operands
     * fetches (using PC0) instead of instruction fetches.
     */
    f8.dbus = f8.io = cpu_readop_arg(f8.pc0);
    f8.pc0 += 1;
    f8_icount -= insttim;
}

static void ROMC_04(void)
{
    /*
     * Copy the contents of PC1 into PC0
     */
    f8.pc0 = f8.pc1;
    f8_icount -= cS;
}

static void ROMC_05(void)
{
    /*
     * Store the data bus contents into the memory location pointed
     * to by DC0; increment DC0.
     */
    program_write_byte_8(f8.dc0, f8.dbus);
    f8.dc0 += 1;
    f8_icount -= cL;
}

static void ROMC_06(void)
{
    /*
     * Place the high order byte of DC0 on the data bus.
     */
    f8.dbus = f8.dc0 >> 8;
    f8_icount -= cL;
}

static void ROMC_07(void)
{
    /*
     * Place the high order byte of PC1 on the data bus.
     */
    f8.dbus = f8.pc1 >> 8;
    f8_icount -= cL;
}

static void ROMC_08(void)
{
    /*
     * All devices copy the contents of PC0 into PC1. The CPU outputs
     * zero on the data bus in this ROMC state. Load the data bus into
     * both halves of PC0, thus clearing the register.
     */
    f8.pc1 = f8.pc0;
    f8.dbus = 0;
    f8.pc0 = 0;
    f8_icount -= cL;
}

static void ROMC_09(void)
{
    /*
     * The device whose address space includes the contents of the DC0
     * register must place the low order byte of DC0 onto the data bus.
     */
    f8.dbus = f8.dc0 & 0xff;
    f8_icount -= cL;
}

static void ROMC_0A(void)
{
    /*
     * All devices add the 8-bit value on the data bus, treated as
     * signed binary number, to the data counter.
     */
	f8.dc0 += (INT8)f8.dbus;
    f8_icount -= cL;
}

static void ROMC_0B(void)
{
    /*
     * The device whose address space includes the value in PC1
     * must place the low order byte of PC1 onto the data bus.
     */
    f8.dbus = f8.pc1 & 0xff;
    f8_icount -= cL;
}

static void ROMC_0C(void)
{
    /*
     * The device whose address space includes the contents of the PC0
     * register must place the contents of the memory word addressed
     * by PC0 into the data bus; then all devices move the value that
     * has just been placed on the data bus into the low order byte of PC0.
     */
    f8.dbus = cpu_readop_arg(f8.pc0);
    f8.pc0 = (f8.pc0 & 0xff00) | f8.dbus;
    f8_icount -= cL;
}

static void ROMC_0D(void)
{
    /*
     * All devices store in PC1 the current contents of PC0, incremented
     * by 1; PC0 is unaltered.
     */
    f8.pc1 = f8.pc0 + 1;
    f8_icount -= cS;
}

static void ROMC_0E(void)
{
    /*
     * The device whose address space includes the contents of the PC0
     * register must place the word addressed by PC0 into the data bus.
     * The value on the data bus is then moved to the low order byte
     * of DC0 by all devices.
     */
    f8.dbus = cpu_readop_arg(f8.pc0);
    f8.dc0 = (f8.dc0 & 0xff00) | f8.dbus;
    f8_icount -= cL;
}

static void ROMC_0F(void)
{
    /*
     * The interrupting device with highest priority must place the
     * low order byte of the interrupt vector on the data bus.
     * All devices must copy the contents of PC0 into PC1. All devices
     * must move the contents of the data bus into the low order
     * byte of PC0.
     */
    f8.irq_vector = (*f8.irq_callback)(0);
    f8.dbus = f8.irq_vector & 0x00ff;
    f8.pc1 = f8.pc0;
    f8.pc0 = (f8.pc0 & 0xff00) | f8.dbus;
    f8_icount -= cL;
}

#if 0
static void ROMC_10(void)
{
    /*
     * Inhibit any modification to the interrupt priority logic.
     */
    f8.w |= 0x20;   /* ???? */
    f8_icount -= cL;
}
#endif

static void ROMC_11(void)
{
    /*
     * The device whose address space includes the contents of PC0
     * must place the contents of the addressed memory word on the
     * data bus. All devices must then move the contents of the
     * data bus to the upper byte of DC0.
     */
    f8.dbus = cpu_readop_arg(f8.pc0);
	f8.dc0 = (f8.dc0 & 0x00ff) | (f8.dbus << 8);
    f8_icount -= cL;
}

static void ROMC_12(void)
{
    /*
     * All devices copy the contents of PC0 into PC1. All devices then
     * move the contents of the data bus into the low order byte of PC0.
     */
    f8.pc1 = f8.pc0;
    f8.pc0 = (f8.pc0 & 0xff00) | f8.dbus;
    f8_icount -= cL;
}

static void ROMC_13(void)
{
    /*
     * The interrupting device with highest priority must move the high
     * order half of the interrupt vector onto the data bus. All devices
     * must then move the contents of the data bus into the high order
     * byte of PC0. The interrupting device resets its interrupt circuitry
     * (so that it is no longer requesting CPU servicing and can respond
     * to another interrupt).
     */
    f8.dbus = f8.irq_vector >> 8;
    f8.pc0 = (f8.pc0 & 0x00ff) | (f8.dbus << 8);
    f8.w&=~I;
    f8_icount -= cL;
}

static void ROMC_14(void)
{
    /*
     * All devices move the contents of the data bus into the high
     * order byte of PC0.
     */
    f8.pc0 = (f8.pc0 & 0x00ff) | (f8.dbus << 8);
    f8_icount -= cL;
}

static void ROMC_15(void)
{
    /*
     * All devices move the contents of the data bus into the high
     * order byte of PC1.
     */
    f8.pc1 = (f8.pc1 & 0x00ff) | (f8.dbus << 8);
    f8_icount -= cL;
}

static void ROMC_16(void)
{
    /*
     * All devices move the contents of the data bus into the high
     * order byte of DC0.
     */
    f8.dc0 = (f8.dc0 & 0x00ff) | (f8.dbus << 8);
    f8_icount -= cL;
}

static void ROMC_17(void)
{
    /*
     * All devices move the contents of the data bus into the low
     * order byte of PC0.
     */
    f8.pc0 = (f8.pc0 & 0xff00) | f8.dbus;
    f8_icount -= cL;
}

static void ROMC_18(void)
{
    /*
     * All devices move the contents of the data bus into the low
     * order byte of PC1.
     */
    f8.pc1 = (f8.pc1 & 0xff00) | f8.dbus;
    f8_icount -= cL;
}

static void ROMC_19(void)
{
    /*
     * All devices move the contents of the data bus into the low
     * order byte of DC0.
     */
    f8.dc0 = (f8.dc0 & 0xff00) | f8.dbus;
    f8_icount -= cL;
}

static void ROMC_1A(void)
{
    /*
     * During the prior cycle, an I/O port timer or interrupt control
     * register was addressed; the device containing the addressed port
     * must place the contents of the data bus into the address port.
     */
    io_write_byte_8(f8.io, f8.dbus);
    f8_icount -= cL;
}

static void ROMC_1B(void)
{
    /*
     * During the prior cycle, the data bus specified the address of an
     * I/O port. The device containing the addressed I/O port must place
     * the contents of the I/O port on the data bus. (Note that the
     * contents of timer and interrupt control registers cannot be read
     * back onto the data bus).
     */
	f8.dbus = io_read_byte_8(f8.io);
    f8_icount -= cL;
}

static void ROMC_1C(int insttim)	/* SKR - added parameter to tell if  */
                                    /* it is long or short based on inst */
{
    /*
     * None.
     */
    f8_icount -= insttim;
}

static void ROMC_1D(void)
{
    /*
     * Devices with DC0 and DC1 registers must switch registers.
     * Devices without a DC1 register perform no operation.
     */
    UINT16 tmp = f8.dc0;
    f8.dc0 = f8.dc1;
    f8.dc1 = tmp;
    f8_icount -= cS;
}

#if 0
static void ROMC_1E(void)
{
    /*
     * The devices whose address space includes the contents of PC0
     * must place the low order byte of PC0 onto the data bus.
     */
    f8.dbus = f8.pc0 & 0xff;
    f8_icount -= cL;
}

static void ROMC_1F(void)
{
    /*
     * The devices whose address space includes the contents of PC0
     * must place the high order byte of PC0 onto the data bus.
     */
    f8.dbus = (f8.pc0 >> 8) & 0xff;
    f8_icount -= cL;
}
#endif

/***********************************
 *	illegal opcodes
 ***********************************/
static void illegal(void)
{
    logerror("f8 illegal opcode at 0x%04x: %02x\n", f8.pc0, f8.dbus);
}

/***************************************************
 *	O Z C S 0000 0000
 *	- - - - LR	A,KU
 ***************************************************/
static void f8_lr_a_ku(void)
{
    f8.a = f8.r[12];
}

/***************************************************
 *	O Z C S 0000 0001
 *	- - - - LR	A,KL
 ***************************************************/
static void f8_lr_a_kl(void)
{
    f8.a = f8.r[13];
}

/***************************************************
 *	O Z C S 0000 0010
 *	- - - - LR	A,QU
 ***************************************************/
static void f8_lr_a_qu(void)
{
    f8.a = f8.r[14];
}

/***************************************************
 *	O Z C S 0000 0011
 *	- - - - LR	A,QL
 ***************************************************/
static void f8_lr_a_ql(void)
{
    f8.a = f8.r[15];
}

/***************************************************
 *	O Z C S 0000 0100
 *	- - - - LR	KU,A
 ***************************************************/
static void f8_lr_ku_a(void)
{
    f8.r[12] = f8.a;
}

/***************************************************
 *	O Z C S 0000 0101
 *	- - - - LR	KL,A
 ***************************************************/
static void f8_lr_kl_a(void)
{
    f8.r[13] = f8.a;
}

/***************************************************
 *	O Z C S 0000 0110
 *	- - - - LR	QU,A
 ***************************************************/
static void f8_lr_qu_a(void)
{
    f8.r[14] = f8.a;
}

/***************************************************
 *	O Z C S 0000 0111
 *	- - - - LR	QL,A
 ***************************************************/
static void f8_lr_ql_a(void)
{
    f8.r[15] = f8.a;
}

/***************************************************
 *	O Z C S 0000 1000
 *	- - - - LR	K,P
 ***************************************************/
static void f8_lr_k_p(void)
{
    ROMC_07();
    f8.r[12] = f8.dbus;
    ROMC_0B();
    f8.r[13] = f8.dbus;
}

/***************************************************
 *	O Z C S 0000 1001
 *	- - - - LR	P,K
 ***************************************************/
static void f8_lr_p_k(void)
{
    f8.dbus = f8.r[12];
    ROMC_15();
    f8.dbus = f8.r[13];
    ROMC_18();
}

/***************************************************
 *	O Z C S 0000 1010
 *	- - - - LR	A,IS
 ***************************************************/
static void f8_lr_a_is(void)
{
    f8.a = f8.is;
}

/***************************************************
 *	O Z C S 0000 1011
 *	- - - - LR	IS,A
 ***************************************************/
static void f8_lr_is_a(void)
{
    f8.is = f8.a & 0x3f;
}

/***************************************************
 *	O Z C S 0000 1100
 *	- - - - PK
 ***************************************************/
static void f8_pk(void)
{
    f8.dbus = f8.r[13];
    ROMC_12();
    f8.dbus = f8.r[12];
    ROMC_14();
}

/***************************************************
 *	O Z C S 0000 1101
 *	- - - - LR	P0,Q
 ***************************************************/
static void f8_lr_p0_q(void)
{
    f8.dbus = f8.r[15];
    ROMC_17();
    f8.dbus = f8.r[14];
    ROMC_14();
}

/***************************************************
 *	O Z C S 0000 1110
 *	- - - - LR	 Q,DC
 ***************************************************/
static void f8_lr_q_dc(void)
{
    ROMC_06();
    f8.r[14] = f8.dbus;
    ROMC_09();
    f8.r[15] = f8.dbus;
}

/***************************************************
 *	O Z C S 0000 1111
 *	- - - - LR	 DC,Q
 ***************************************************/
static void f8_lr_dc_q(void)
{
    f8.dbus = f8.r[14];
    ROMC_16();
    f8.dbus = f8.r[15];
    ROMC_19();
}

/***************************************************
 *	O Z C S 0001 0000
 *	- - - - LR	 DC,H
 ***************************************************/
static void f8_lr_dc_h(void)
{
    f8.dbus = f8.r[10];
    ROMC_16();
    f8.dbus = f8.r[11];
    ROMC_19();
}

/***************************************************
 *	O Z C S 0001 0001
 *	- - - - LR	 H,DC
 ***************************************************/
static void f8_lr_h_dc(void)
{
    ROMC_06();
    f8.r[10] = f8.dbus;
    ROMC_09();
    f8.r[11] = f8.dbus;
}

/***************************************************
 *	O Z C S 0001 0010
 *	0 x 0 1 SR	 1
 ***************************************************/
static void f8_sr_1(void)
{
    f8.a >>= 1;
    CLR_OZCS;
    SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 0001 0011
 *	0 x 0 x SL	 1
 ***************************************************/
static void f8_sl_1(void)
{
    f8.a <<= 1;
    CLR_OZCS;
    SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 0001 0100
 *	0 x 0 1 SR	 4
 ***************************************************/
static void f8_sr_4(void)
{
    f8.a >>= 4;
    CLR_OZCS;
    SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 0001 0101
 *	0 x 0 x SL	 4
 ***************************************************/
static void f8_sl_4(void)
{
    f8.a <<= 4;
    CLR_OZCS;
    SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 0001 0110
 *	- - - - LM
 ***************************************************/
static void f8_lm(void)
{
    ROMC_02();
    f8.a = f8.dbus;
}

/***************************************************
 *	O Z C S 0001 0111
 *	- - - - ST
 ***************************************************/
static void f8_st(void)
{
    f8.dbus = f8.a;
    ROMC_05();
}

/***************************************************
 *	O Z C S 0001 1000
 *	0 x 0 x COM
 ***************************************************/
static void f8_com(void)
{
    f8.a = ~f8.a;
    CLR_OZCS;
    SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 0001 1001
 *	x x x x LNK
 ***************************************************/
static void f8_lnk(void)
{
    if (f8.w & C)
    {
	CLR_OZCS;
	SET_OC(f8.a,1);
	f8.a += 1;
    }
    else
    {
	CLR_OZCS;
    }
    SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 0001 1010
 *			DI
 ***************************************************/
static void f8_di(void)
{
    ROMC_1C(cS);
    f8.w &= ~I;
}

/***************************************************
 *	O Z C S 0001 1011
 *			EI
 ***************************************************/
static void f8_ei(void)
{
    ROMC_1C(cS);
    f8.w |= I;
}

/***************************************************
 *	O Z C S 0001 1100
 *			POP
 ***************************************************/
static void f8_pop(void)
{
    ROMC_04();
}

/***************************************************
 *	O Z C S 0001 1101
 *	x x x x LR	 W,J
 ***************************************************/
static void f8_lr_w_j(void)
{
    ROMC_1C(cS);
    f8.w = f8.r[9];
}

/***************************************************
 *	O Z C S 0001 1110
 *	- - - - LR	 J,W
 ***************************************************/
static void f8_lr_j_w(void)
{
    f8.r[9] = f8.w;
}

/***************************************************
 *	O Z C S 0001 1111
 *	x x x x INC
 ***************************************************/
static void f8_inc(void)
{
    CLR_OZCS;
    SET_OC(f8.a,1);
    f8.a += 1;
    SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 0010 0000	aaaa aaaa
 *	- - - - LI	aa
 ***************************************************/
static void f8_li(void)
{
    ROMC_03(cL);
    f8.a = f8.dbus;
}

/***************************************************
 *	O Z C S 0010 0001	aaaa aaaa
 *	0 x 0 x NI	 aa
 ***************************************************/
static void f8_ni(void)
{
    ROMC_03(cL);
    CLR_OZCS;
    f8.a &= f8.dbus;
    SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 0010 0010	aaaa aaaa
 *	0 x 0 x OI	 aa
 ***************************************************/
static void f8_oi(void)
{
    ROMC_03(cL);
    CLR_OZCS;
    f8.a |= f8.dbus;
    SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 0010 0011	aaaa aaaa
 *	0 x 0 x XI	 aa
 ***************************************************/
static void f8_xi(void)
{
    ROMC_03(cL);
    CLR_OZCS;
    f8.a ^= f8.dbus;
    SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 0010 0100	aaaa aaaa
 *	x x x x AI	 aa
 ***************************************************/
static void f8_ai(void)
{
    ROMC_03(cL);
    CLR_OZCS;
    SET_OC(f8.a,f8.dbus);
    f8.a += f8.dbus;
    SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 0010 0101	aaaa aaaa
 *	x x x x CI	 aa
 ***************************************************/
static void f8_ci(void)
{
    UINT16 tmp = ((UINT8)~f8.a) + 1;
    ROMC_03(cL);
    CLR_OZCS;
    SET_OC(tmp,f8.dbus);
    tmp += f8.dbus;
    SET_SZ((UINT8)tmp);
}

/***************************************************
 *	O Z C S 0010 0110	aaaa aaaa
 *	0 x 0 x IN	 aa
 ***************************************************/
static void f8_in(void)
{
    ROMC_03(cL);
    CLR_OZCS;
    ROMC_1B();
    f8.a = f8.dbus;
    SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 0010 0111	aaaa aaaa
 *	- - - - OUT  aa
 ***************************************************/
static void f8_out(void)
{
    ROMC_03(cL);
    f8.dbus = f8.a;
    ROMC_1A();
}

/***************************************************
 *	O Z C S 0010 1000	iiii iiii	jjjj jjjj
 *	- - - - PI	 iijj
 ***************************************************/
static void f8_pi(void)
{
    ROMC_03(cL);
    f8.a = f8.dbus;
    ROMC_0D();
    ROMC_0C();
    f8.dbus = f8.a;
    ROMC_14();
}

/***************************************************
 *	O Z C S 0010 1001	iiii iiii	jjjj jjjj
 *	- - - - JMP  iijj
 ***************************************************/
static void f8_jmp(void)
{
    ROMC_03(cL);
    f8.a = f8.dbus;
    ROMC_0C();
    f8.dbus = f8.a;
    ROMC_14();
}

/***************************************************
 *	O Z C S 0010 1010	iiii iiii	jjjj jjjj
 *	- - - - DCI  iijj
 ***************************************************/
static void f8_dci(void)
{
    ROMC_11();
    ROMC_03(cS);
    ROMC_0E();
    ROMC_03(cS);
}

/***************************************************
 *	O Z C S 0010 1011
 *	- - - - NOP
 ***************************************************/
static void f8_nop(void)
{
}

/***************************************************
 *	O Z C S 0010 1100
 *	- - - - XDC
 ***************************************************/
static void f8_xdc(void)
{
    ROMC_1D();
}

/***************************************************
 *	O Z C S 0011 rrrr
 *	x x x x DS	 r
 ***************************************************/
static void f8_ds_r(int r)
{
    CLR_OZCS;
    SET_OC(f8.r[r], 0xff);
    f8.r[r] = f8.r[r] + 0xff;
    SET_SZ(f8.r[r]);
}

/***************************************************
 *	O Z C S 0011 1100
 *	x x x x DS	 ISAR
 ***************************************************/
static void f8_ds_isar(void)
{
    CLR_OZCS;
    SET_OC(f8.r[f8.is], 0xff);
    f8.r[f8.is] = f8.r[f8.is] + 0xff;
    SET_SZ(f8.r[f8.is]);
}

/***************************************************
 *	O Z C S 0011 1101
 *	x x x x DS	 ISAR++
 ***************************************************/
static void f8_ds_isar_i(void)
{
    CLR_OZCS;
    SET_OC(f8.r[f8.is], 0xff);
    f8.r[f8.is] = f8.r[f8.is] + 0xff;
    SET_SZ(f8.r[f8.is]);
    f8.is = (f8.is & 0x38) | ((f8.is + 1) & 0x07);
}

/***************************************************
 *	O Z C S 0011 1110
 *	x x x x DS	ISAR--
 ***************************************************/
static void f8_ds_isar_d(void)
{
    CLR_OZCS;
    SET_OC(f8.r[f8.is], 0xff);
    f8.r[f8.is] = f8.r[f8.is] + 0xff;
    SET_SZ(f8.r[f8.is]);
    f8.is = (f8.is & 0x38) | ((f8.is - 1) & 0x07);
}

/***************************************************
 *	O Z C S 0100 rrrr
 *	- - - - LR	A,r
 ***************************************************/
static void f8_lr_a_r(int r)
{
    f8.a = f8.r[r];
}

/***************************************************
 *	O Z C S 0100 1100
 *	- - - - LR	A,ISAR
 ***************************************************/
static void f8_lr_a_isar(void)
{
    f8.a = f8.r[f8.is];
}

/***************************************************
 *	O Z C S 0100 1101
 *	- - - - LR	A,ISAR++
 ***************************************************/
static void f8_lr_a_isar_i(void)
{
    f8.a = f8.r[f8.is];
    f8.is = (f8.is & 0x38) | ((f8.is + 1) & 0x07);
}

/***************************************************
 *	O Z C S 0100 1110
 *	- - - - LR	A,ISAR--
 ***************************************************/
static void f8_lr_a_isar_d(void)
{
    f8.a = f8.r[f8.is];
    f8.is = (f8.is & 0x38) | ((f8.is - 1) & 0x07);
}

/***************************************************
 *	O Z C S 0101 rrrr
 *	- - - - LR	r,A
 ***************************************************/
static void f8_lr_r_a(int r)
{
    f8.r[r] = f8.a;
}

/***************************************************
 *	O Z C S 0101 1100
 *	- - - - LR	ISAR,A
 ***************************************************/
static void f8_lr_isar_a(void)
{
    f8.r[f8.is] = f8.a;
}

/***************************************************
 *	O Z C S 0101 1101
 *	- - - - LR	ISAR++,A
 ***************************************************/
static void f8_lr_isar_i_a(void)
{
    f8.r[f8.is] = f8.a;
    f8.is = (f8.is & 0x38) | ((f8.is + 1) & 0x07);
}

/***************************************************
 *	O Z C S 0101 1110
 *	- - - - LR	ISAR--,A
 ***************************************************/
static void f8_lr_isar_d_a(void)
{
    f8.r[f8.is] = f8.a;
    f8.is = (f8.is & 0x38) | ((f8.is - 1) & 0x07);
}

/***************************************************
 *	O Z C S 0110 0eee
 *	- - - - LISU e
 ***************************************************/
static void f8_lisu(int e)
{
    f8.is = (f8.is & 0x07) | e;
}

/***************************************************
 *	O Z C S 0110 1eee
 *	- - - - LISL e
 ***************************************************/
static void f8_lisl(int e)
{
    f8.is = (f8.is & 0x38) | e;
}

/***************************************************
 *	O Z C S 0111 iiii
 *	- - - - LIS  i
 ***************************************************/
static void f8_lis(int i)
{
    f8.a = i;
}

/***************************************************
 *	O Z C S 1000 0eee	aaaa aaaa
 *			BT	 e,aa
 ***************************************************/
static void f8_bt(int e)
{
    ROMC_1C(cS);
    if (f8.w & e)
	ROMC_01();	   /* take the relative branch */
    else
	ROMC_03(cS);	   /* just read the argument on the data bus */
}

/***************************************************
 *	O Z C S 1000 1000
 *	x x x x AM
 ***************************************************/
static void f8_am(void)
{
    ROMC_02();
    CLR_OZCS;
    SET_OC(f8.a, f8.dbus);
    f8.a += f8.dbus;
    SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 1000 1001
 *	x x x x AMD
 ***************************************************/
static void f8_amd(void)
{
    UINT8 tmp = f8.a - 0x66, adj = 0x00;
    int sum;
    ROMC_02();
    sum = (tmp & 0x0f) + (f8.dbus & 0x0f);
    if (sum > 0x09)
	adj += 0x06;
    sum = tmp + f8.dbus + adj;
    if (sum > 0x99)
	adj += 0x60;
    tmp += adj;
    CLR_OZCS;
    SET_OC(tmp,f8.dbus);
    f8.a = tmp + f8.dbus;
    SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 1000 1010
 *	0 x 0 x NM
 ***************************************************/
static void f8_nm(void)
{
    ROMC_02();
    CLR_OZCS;
    f8.a &= f8.dbus;
    SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 1000 1011
 *	0 x 0 x OM
 ***************************************************/
static void f8_om(void)
{
    ROMC_02();
    CLR_OZCS;
    f8.a |= f8.dbus;
    SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 1000 1100
 *	0 x 0 x XM
 ***************************************************/
static void f8_xm(void)
{
    ROMC_02();
    CLR_OZCS;
    f8.a ^= f8.dbus;
    SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 1000 1101
 *	0 x 0 x CM
 ***************************************************/
static void f8_cm(void)	/* SKR changed to match f8_ci() */
{
    UINT16 tmp = ((UINT8)~f8.a) + 1;
	ROMC_02();
	CLR_OZCS;
	SET_OC(tmp,f8.dbus);
	tmp += f8.dbus;
	SET_SZ((UINT8)tmp);
}

/***************************************************
 *	O Z C S 1000 1110
 *	- - - - ADC
 ***************************************************/
static void f8_adc(void)
{
    f8.dbus = f8.a;
    ROMC_0A();			/* add data bus value to DC0 */
}

/***************************************************
 *	O Z C S 1000 1111
 *	- - - - BR7
 ***************************************************/
static void f8_br7(void)
{
    if ((f8.is & 7) == 7)
	ROMC_03(cS);		/* just read the argument on the data bus */
    else
	ROMC_01();		/* take the relative branch */
}

/***************************************************
 *	O Z C S 1001 tttt	aaaa aaaa
 *	- - - - BF	 t,aa
 ***************************************************/
static void f8_bf(int t)
{
    ROMC_1C(cS);
    if (f8.w & t)
        ROMC_03(cS);      /* just read the argument on the data bus */
    else
        ROMC_01();      /* take the relative branch */
}

/***************************************************
 *	O Z C S 1010 000n
 *	0 x 0 x INS  n				(n = 0-1)
 ***************************************************/
static void f8_ins_0(int n)
{
    ROMC_1C(cS);
    CLR_OZCS;
    f8.a = io_read_byte_8(n);
    SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 1010 nnnn
 *	0 x 0 x INS  n				(n = 4-F)
 ***************************************************/
static void f8_ins_1(int n)
{
    ROMC_1C(cL);
    f8.io = n;
    ROMC_1B();
    CLR_OZCS;
    f8.a = f8.dbus;
    SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 1011 000n
 *	- - - - OUTS n				(n = 0-1)
 ***************************************************/
static void f8_outs_0(int n)
{
    ROMC_1C(cS);
    io_write_byte_8(n, f8.a);
}

/***************************************************
 *	O Z C S 1011 nnnn
 *	- - - - OUTS n				(n = 4-F)
 ***************************************************/
static void f8_outs_1(int n)
{
    ROMC_1C(cL);
    f8.io = n;
    f8.dbus = f8.a;
    ROMC_1A();
}

/***************************************************
 *	O Z C S 1100 rrrr
 *	x x x x AS	 r
 ***************************************************/
static void f8_as(int r)
{
	CLR_OZCS;
	SET_OC(f8.a, f8.r[r]);
	f8.a += f8.r[r];
	SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 1100 1100
 *	x x x x AS	 ISAR
 ***************************************************/
static void f8_as_isar(void)
{
	CLR_OZCS;
	SET_OC(f8.a, f8.r[f8.is]);
	f8.a += f8.r[f8.is];
	SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 1100 1101
 *	x x x x AS	 ISAR++
 ***************************************************/
static void f8_as_isar_i(void)
{
	CLR_OZCS;
	SET_OC(f8.a, f8.r[f8.is]);
	f8.a += f8.r[f8.is];
	SET_SZ(f8.a);
	f8.is = (f8.is & 0x38) | ((f8.is + 1) & 0x07);
}

/***************************************************
 *	O Z C S 1100 1110
 *	x x x x AS	 ISAR--
 ***************************************************/
static void f8_as_isar_d(void)
{
	CLR_OZCS;
	SET_OC(f8.a, f8.r[f8.is]);
	f8.a += f8.r[f8.is];
	SET_SZ(f8.a);
	f8.is = (f8.is & 0x38) | ((f8.is - 1) & 0x07);
}

/***************************************************
 *	O Z C S 1101 rrrr
 *	x x x x ASD  r
 ***************************************************/
static void f8_asd(int r)
{
	UINT8 tmp = f8.a - 0x66, adj = 0x00;
	int sum;
	ROMC_1C(cS);
	sum = (tmp & 0x0f) + (f8.r[r] & 0x0f);
	if (sum > 0x09)
		adj += 0x06;
	sum = tmp + f8.r[r] + adj;
	if (sum > 0x99)
		adj += 0x60;
	tmp += adj;
	CLR_OZCS;
	SET_OC(tmp, f8.r[r]);
	f8.a = tmp + f8.r[r];
	SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 1101 1100
 *	x x x x ASD  ISAR
 ***************************************************/
static void f8_asd_isar(void)
{
	UINT8 tmp = f8.a - 0x66, adj = 0x00;
	int sum;
	ROMC_1C(cS);
	sum = (tmp & 0x0f) + (f8.r[f8.is] & 0x0f);
	if (sum > 0x09)
		adj += 0x06;
	sum = tmp + f8.r[f8.is] + adj;
	if (sum > 0x99)
		adj += 0x60;
	tmp += adj;
	CLR_OZCS;
	SET_OC(tmp, f8.r[f8.is]);
	f8.a = tmp + f8.r[f8.is];
	SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 1101 1101
 *	x x x x ASD  ISAR++
 ***************************************************/
static void f8_asd_isar_i(void)
{
	UINT8 tmp = f8.a - 0x66, adj = 0x00;
	int sum;
	ROMC_1C(cS);
	sum = (tmp & 0x0f) + (f8.r[f8.is] & 0x0f);
	if (sum > 0x09)
		adj += 0x06;
	sum = tmp + f8.r[f8.is] + adj;
	if (sum > 0x99)
		adj += 0x60;
	tmp += adj;
	CLR_OZCS;
	SET_OC(tmp, f8.r[f8.is]);
	f8.a = tmp + f8.r[f8.is];
	SET_SZ(f8.a);
	f8.is = (f8.is & 0x38) | ((f8.is + 1) & 0x07);
}

/***************************************************
 *	O Z C S 1101 1110
 *	x x x x ASD  ISAR--
 ***************************************************/
static void f8_asd_isar_d(void)
{
	UINT8 tmp = f8.a - 0x66, adj = 0x00;
	int sum;
	ROMC_1C(cS);
	sum = (tmp & 0x0f) + (f8.r[f8.is] & 0x0f);
	if (sum > 0x09)
		adj += 0x06;
	sum = tmp + f8.r[f8.is] + adj;
	if (sum > 0x99)
		adj += 0x60;
	tmp += adj;
	CLR_OZCS;
	SET_OC(tmp, f8.r[f8.is]);
	f8.a = tmp + f8.r[f8.is];
	SET_SZ(f8.a);
	f8.is = (f8.is & 0x38) | ((f8.is - 1) & 0x07);
}

/***************************************************
 *	O Z C S 1110 rrrr
 *	0 x 0 x XS	 r
 ***************************************************/
static void f8_xs(int r)
{
	CLR_OZCS;
	f8.a ^= f8.r[r];
	SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 1110 1100
 *	0 x 0 x XS	 ISAR
 ***************************************************/
static void f8_xs_isar(void)
{
	CLR_OZCS;
	f8.a ^= f8.r[f8.is];
	SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 1110 1101
 *	0 x 0 x XS	 ISAR++
 ***************************************************/
static void f8_xs_isar_i(void)
{
	CLR_OZCS;
	f8.a ^= f8.r[f8.is];
	SET_SZ(f8.a);
	f8.is = (f8.is & 0x38) | ((f8.is + 1) & 0x07);
}

/***************************************************
 *	O Z C S 1110 1110
 *	0 x 0 x XS	 ISAR--
 ***************************************************/
static void f8_xs_isar_d(void)
{
	CLR_OZCS;
	f8.a ^= f8.r[f8.is];
	SET_SZ(f8.a);
	f8.is = (f8.is & 0x38) | ((f8.is - 1) & 0x07);
}

/***************************************************
 *	O Z C S 1111 rrrr
 *	0 x 0 x NS	 r
 ***************************************************/
static void f8_ns(int r)
{
	CLR_OZCS;
	f8.a &= f8.r[r];
	SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 1111 1100
 *	0 x 0 x NS	 ISAR
 ***************************************************/
static void f8_ns_isar(void)
{
	CLR_OZCS;
	f8.a &= f8.r[f8.is];
	SET_SZ(f8.a);
}

/***************************************************
 *	O Z C S 1111 1101
 *	0 x 0 x NS	 ISAR++
 ***************************************************/
static void f8_ns_isar_i(void)
{
	CLR_OZCS;
	f8.a &= f8.r[f8.is];
	SET_SZ(f8.a);
	f8.is = (f8.is & 0x38) | ((f8.is + 1) & 0x07);
}

/***************************************************
 *	O Z C S 1111 1110
 *	0 x 0 x NS	 ISAR--
 ***************************************************/
static void f8_ns_isar_d(void)
{
	CLR_OZCS;
	f8.a &= f8.r[f8.is];
	SET_SZ(f8.a);
	f8.is = (f8.is & 0x38) | ((f8.is - 1) & 0x07);
}

void f8_reset(void *param)
{
	UINT8 data;
	int i;

	memset(&f8, 0, sizeof(f8_Regs));
    f8.w&=~I;

	/* save PC0 to PC1 and reset PC0 */
	ROMC_08();
	/* fetch the first opcode */
	ROMC_00(cS);

	/* initialize the timer shift register
	 * this is an 8 bit polynome counter which can be loaded parallel
	 * with 0xff the outputs never change and thus the timer is disabled.
	 * with 0xfe the shifter starts cycling through 255 states until it
	 * reaches 0xfe again (and then issues an interrupt).
	 * the counter output values are not sequential, but go like this:
	 * 0xfe, 0xfd, 0xfb, 0xf7, 0xee, 0xdc ... etc. :-)
	 * We have to build a lookup table to tell how many cycles a write

	 */
	data = 0xfe;	/* initial value */
	for (i = 0; i < 256; i++)
	{
		timer_shifter[i] = data;
		if ( (((data >> 3) ^ (data >> 4)) ^
			  ((data >> 5) ^ (data >> 7))) & 1 )
			data <<= 1;
		else
			data = (data << 1) | 1;
	}
}
/* Shut down CPU core */
void f8_exit(void)
{
	/* nothing to do */
}

/* Execute cycles - returns number of cycles actually run */
int f8_execute(int cycles)
{
    f8_icount = cycles;

    do
    {
	UINT8 op=f8.dbus;
        CALL_MAME_DEBUG;

	switch( op )
        {
	/* opcode  bitmask */
	case 0x00: /* 0000 0000 */	f8_lr_a_ku();		break;
	case 0x01: /* 0000 0001 */	f8_lr_a_kl();		break;
	case 0x02: /* 0000 0010 */	f8_lr_a_qu();		break;
	case 0x03: /* 0000 0011 */	f8_lr_a_ql();		break;
	case 0x04: /* 0000 0100 */	f8_lr_ku_a();		break;
	case 0x05: /* 0000 0101 */	f8_lr_kl_a();		break;
	case 0x06: /* 0000 0110 */	f8_lr_qu_a();		break;
	case 0x07: /* 0000 0111 */	f8_lr_ql_a();		break;
	case 0x08: /* 0000 1000 */	f8_lr_k_p();		break;
	case 0x09: /* 0000 1001 */	f8_lr_p_k();		break;
	case 0x0a: /* 0000 1010 */	f8_lr_a_is();		break;
	case 0x0b: /* 0000 1011 */	f8_lr_is_a();		break;
	case 0x0c: /* 0000 1100 */	f8_pk();			break;
	case 0x0d: /* 0000 1101 */	f8_lr_p0_q();		break;
	case 0x0e: /* 0000 1110 */	f8_lr_q_dc();		break;
	case 0x0f: /* 0000 1111 */	f8_lr_dc_q();		break;

        case 0x10: /* 0001 0000 */  f8_lr_dc_h();       break;
	case 0x11: /* 0001 0001 */	f8_lr_h_dc();		break;
	case 0x12: /* 0001 0010 */	f8_sr_1();			break;
	case 0x13: /* 0001 0011 */	f8_sl_1();			break;
	case 0x14: /* 0001 0100 */	f8_sr_4();			break;
	case 0x15: /* 0001 0101 */	f8_sl_4();			break;
	case 0x16: /* 0001 0110 */	f8_lm();			break;
	case 0x17: /* 0001 0111 */	f8_st();			break;
	case 0x18: /* 0001 1000 */	f8_com();			break;
	case 0x19: /* 0001 1001 */	f8_lnk();			break;
	case 0x1a: /* 0001 1010 */	f8_di();			break;
	case 0x1b: /* 0001 1011 */	f8_ei();			break;
	case 0x1c: /* 0001 1100 */	f8_pop();			break;
	case 0x1d: /* 0001 1101 */	f8_lr_w_j();		break;
	case 0x1e: /* 0001 1110 */	f8_lr_j_w();		break;
	case 0x1f: /* 0001 1111 */	f8_inc();			break;

        case 0x20: /* 0010 0000 */  f8_li();            break;
	case 0x21: /* 0010 0001 */	f8_ni();			break;
	case 0x22: /* 0010 0010 */	f8_oi();			break;
	case 0x23: /* 0010 0011 */	f8_xi();			break;
	case 0x24: /* 0010 0100 */	f8_ai();			break;
	case 0x25: /* 0010 0101 */	f8_ci();			break;
	case 0x26: /* 0010 0110 */	f8_in();			break;
	case 0x27: /* 0010 0111 */	f8_out();			break;
	case 0x28: /* 0010 1000 */	f8_pi();			break;
	case 0x29: /* 0010 1001 */	f8_jmp();			break;
	case 0x2a: /* 0010 1010 */	f8_dci();			break;
	case 0x2b: /* 0010 1011 */	f8_nop();			break;
	case 0x2c: /* 0010 1100 */	f8_xdc();			break;
	case 0x2d: /* 0010 1101 */	illegal();			break;
	case 0x2e: /* 0010 1110 */	illegal();			break;
	case 0x2f: /* 0010 1111 */	illegal();			break;

        case 0x30: /* 0011 0000 */  f8_ds_r( 0);        break;
	case 0x31: /* 0011 0001 */	f8_ds_r( 1);		break;
	case 0x32: /* 0011 0010 */	f8_ds_r( 2);		break;
	case 0x33: /* 0011 0011 */	f8_ds_r( 3);		break;
	case 0x34: /* 0011 0100 */	f8_ds_r( 4);		break;
	case 0x35: /* 0011 0101 */	f8_ds_r( 5);		break;
	case 0x36: /* 0011 0110 */	f8_ds_r( 6);		break;
	case 0x37: /* 0011 0111 */	f8_ds_r( 7);		break;
	case 0x38: /* 0011 1000 */	f8_ds_r( 8);		break;
	case 0x39: /* 0011 1001 */	f8_ds_r( 9);		break;
	case 0x3a: /* 0011 1010 */	f8_ds_r(10);		break;
	case 0x3b: /* 0011 1011 */	f8_ds_r(11);		break;
	case 0x3c: /* 0011 1100 */	f8_ds_isar();		break;
	case 0x3d: /* 0011 1101 */	f8_ds_isar_i(); 	break;
	case 0x3e: /* 0011 1110 */	f8_ds_isar_d(); 	break;
	case 0x3f: /* 0011 1111 */	illegal();			break;

        case 0x40: /* 0100 0000 */  f8_lr_a_r( 0);      break;
	case 0x41: /* 0100 0001 */	f8_lr_a_r( 1);		break;
	case 0x42: /* 0100 0010 */	f8_lr_a_r( 2);		break;
	case 0x43: /* 0100 0011 */	f8_lr_a_r( 3);		break;
	case 0x44: /* 0100 0100 */	f8_lr_a_r( 4);		break;
	case 0x45: /* 0100 0101 */	f8_lr_a_r( 5);		break;
	case 0x46: /* 0100 0110 */	f8_lr_a_r( 6);		break;
	case 0x47: /* 0100 0111 */	f8_lr_a_r( 7);		break;
	case 0x48: /* 0100 1000 */	f8_lr_a_r( 8);		break;
	case 0x49: /* 0100 1001 */	f8_lr_a_r( 9);		break;
	case 0x4a: /* 0100 1010 */	f8_lr_a_r(10);		break;
	case 0x4b: /* 0100 1011 */	f8_lr_a_r(11);		break;
	case 0x4c: /* 0100 1100 */	f8_lr_a_isar(); 	break;
	case 0x4d: /* 0100 1101 */	f8_lr_a_isar_i();	break;
	case 0x4e: /* 0100 1110 */	f8_lr_a_isar_d();	break;
	case 0x4f: /* 0100 1111 */	illegal();			break;

	case 0x50: /* 0101 0000 */	f8_lr_r_a( 0);		break;
	case 0x51: /* 0101 0001 */	f8_lr_r_a( 1);		break;
	case 0x52: /* 0101 0010 */	f8_lr_r_a( 2);		break;
	case 0x53: /* 0101 0011 */	f8_lr_r_a( 3);		break;
	case 0x54: /* 0101 0100 */	f8_lr_r_a( 4);		break;
	case 0x55: /* 0101 0101 */	f8_lr_r_a( 5);		break;
	case 0x56: /* 0101 0110 */	f8_lr_r_a( 6);		break;
	case 0x57: /* 0101 0111 */	f8_lr_r_a( 7);		break;
	case 0x58: /* 0101 1000 */	f8_lr_r_a( 8);		break;
	case 0x59: /* 0101 1001 */	f8_lr_r_a( 9);		break;
	case 0x5a: /* 0101 1010 */	f8_lr_r_a(10);		break;
	case 0x5b: /* 0101 1011 */	f8_lr_r_a(11);		break;
	case 0x5c: /* 0101 1100 */	f8_lr_isar_a(); 	break;
	case 0x5d: /* 0101 1101 */	f8_lr_isar_i_a();	break;
	case 0x5e: /* 0101 1110 */	f8_lr_isar_d_a();	break;
	case 0x5f: /* 0101 1111 */	illegal();			break;

	case 0x60: /* 0110 0000 */	f8_lisu(0x00);		break;
	case 0x61: /* 0110 0001 */	f8_lisu(0x08);		break;
	case 0x62: /* 0110 0010 */	f8_lisu(0x10);		break;
	case 0x63: /* 0110 0011 */	f8_lisu(0x18);		break;
	case 0x64: /* 0110 0100 */	f8_lisu(0x20);		break;
	case 0x65: /* 0110 0101 */	f8_lisu(0x28);		break;
	case 0x66: /* 0110 0110 */	f8_lisu(0x30);		break;
	case 0x67: /* 0110 0111 */	f8_lisu(0x38);		break;
	case 0x68: /* 0110 1000 */	f8_lisl(0x00);		break;
	case 0x69: /* 0110 1001 */	f8_lisl(0x01);		break;
	case 0x6a: /* 0110 1010 */	f8_lisl(0x02);		break;
	case 0x6b: /* 0110 1011 */	f8_lisl(0x03);		break;
	case 0x6c: /* 0110 1100 */	f8_lisl(0x04);		break;
	case 0x6d: /* 0110 1101 */	f8_lisl(0x05);		break;
	case 0x6e: /* 0110 1110 */	f8_lisl(0x06);		break;
	case 0x6f: /* 0110 1111 */	f8_lisl(0x07);		break;

	case 0x70: /* 0111 0000 */	f8_lis(0x0);		break;
	case 0x71: /* 0111 0001 */	f8_lis(0x1);		break;
	case 0x72: /* 0111 0010 */	f8_lis(0x2);		break;
	case 0x73: /* 0111 0011 */	f8_lis(0x3);		break;
	case 0x74: /* 0111 0100 */	f8_lis(0x4);		break;
	case 0x75: /* 0111 0101 */	f8_lis(0x5);		break;
	case 0x76: /* 0111 0110 */	f8_lis(0x6);		break;
	case 0x77: /* 0111 0111 */	f8_lis(0x7);		break;
	case 0x78: /* 0111 1000 */	f8_lis(0x8);		break;
	case 0x79: /* 0111 1001 */	f8_lis(0x9);		break;
	case 0x7a: /* 0111 1010 */	f8_lis(0xa);		break;
	case 0x7b: /* 0111 1011 */	f8_lis(0xb);		break;
	case 0x7c: /* 0111 1100 */	f8_lis(0xc);		break;
	case 0x7d: /* 0111 1101 */	f8_lis(0xd);		break;
	case 0x7e: /* 0111 1110 */	f8_lis(0xe);		break;
	case 0x7f: /* 0111 1111 */	f8_lis(0xf);		break;

	case 0x80: /* 1000 0000 */	f8_bt(0);			break;
	case 0x81: /* 1000 0001 */	f8_bt(1);			break;
	case 0x82: /* 1000 0010 */	f8_bt(2);			break;
	case 0x83: /* 1000 0011 */	f8_bt(3);			break;
	case 0x84: /* 1000 0100 */	f8_bt(4);			break;
	case 0x85: /* 1000 0101 */	f8_bt(5);			break;
	case 0x86: /* 1000 0110 */	f8_bt(6);			break;
	case 0x87: /* 1000 0111 */	f8_bt(7);			break;
	case 0x88: /* 1000 1000 */	f8_am();			break;
	case 0x89: /* 1000 1001 */	f8_amd();			break;
	case 0x8a: /* 1000 1010 */	f8_nm();			break;
	case 0x8b: /* 1000 1011 */	f8_om();			break;
	case 0x8c: /* 1000 1100 */	f8_xm();			break;
	case 0x8d: /* 1000 1101 */	f8_cm();			break;
	case 0x8e: /* 1000 1110 */	f8_adc();			break;
	case 0x8f: /* 1000 1111 */	f8_br7();			break;

	case 0x90: /* 1001 0000 */	f8_bf(0x0); 		break;
	case 0x91: /* 1001 0001 */	f8_bf(0x1); 		break;
	case 0x92: /* 1001 0010 */	f8_bf(0x2); 		break;
	case 0x93: /* 1001 0011 */	f8_bf(0x3); 		break;
	case 0x94: /* 1001 0100 */	f8_bf(0x4); 		break;
	case 0x95: /* 1001 0101 */	f8_bf(0x5); 		break;
	case 0x96: /* 1001 0110 */	f8_bf(0x6); 		break;
	case 0x97: /* 1001 0111 */	f8_bf(0x7); 		break;
	case 0x98: /* 1001 1000 */	f8_bf(0x8); 		break;
	case 0x99: /* 1001 1001 */	f8_bf(0x9); 		break;
	case 0x9a: /* 1001 1010 */	f8_bf(0xa); 		break;
	case 0x9b: /* 1001 1011 */	f8_bf(0xb); 		break;
	case 0x9c: /* 1001 1100 */	f8_bf(0xc); 		break;
	case 0x9d: /* 1001 1101 */	f8_bf(0xd); 		break;
	case 0x9e: /* 1001 1110 */	f8_bf(0xe); 		break;
	case 0x9f: /* 1001 1111 */	f8_bf(0xf); 		break;

	case 0xa0: /* 1010 0000 */	f8_ins_0(0x0);		break;
	case 0xa1: /* 1010 0001 */	f8_ins_0(0x1);		break;
	case 0xa2: /* 1010 0010 */	illegal();			break;
	case 0xa3: /* 1010 0011 */	illegal();			break;
	case 0xa4: /* 1010 0100 */	f8_ins_1(0x4);		break;
	case 0xa5: /* 1010 0101 */	f8_ins_1(0x5);		break;
	case 0xa6: /* 1010 0110 */	f8_ins_1(0x6);		break;
	case 0xa7: /* 1010 0111 */	f8_ins_1(0x7);		break;
	case 0xa8: /* 1010 1000 */	f8_ins_1(0x8);		break;
	case 0xa9: /* 1010 1001 */	f8_ins_1(0x9);		break;
	case 0xaa: /* 1010 1010 */	f8_ins_1(0xa);		break;
	case 0xab: /* 1010 1011 */	f8_ins_1(0xb);		break;
	case 0xac: /* 1010 1100 */	f8_ins_1(0xc);		break;
	case 0xad: /* 1010 1101 */	f8_ins_1(0xd);		break;
	case 0xae: /* 1010 1110 */	f8_ins_1(0xe);		break;
	case 0xaf: /* 1010 1111 */	f8_ins_1(0xf);		break;

	case 0xb0: /* 1011 0000 */	f8_outs_0(0x0); 	break;
	case 0xb1: /* 1011 0001 */	f8_outs_0(0x1); 	break;
	case 0xb2: /* 1011 0010 */	illegal();			break;
	case 0xb3: /* 1011 0011 */	illegal();			break;
	case 0xb4: /* 1011 0100 */	f8_outs_1(0x4); 	break;
	case 0xb5: /* 1011 0101 */	f8_outs_1(0x5); 	break;
	case 0xb6: /* 1011 0110 */	f8_outs_1(0x6); 	break;
	case 0xb7: /* 1011 0111 */	f8_outs_1(0x7); 	break;
	case 0xb8: /* 1011 1000 */	f8_outs_1(0x8); 	break;
	case 0xb9: /* 1011 1001 */	f8_outs_1(0x9); 	break;
	case 0xba: /* 1011 1010 */	f8_outs_1(0xa); 	break;
	case 0xbb: /* 1011 1011 */	f8_outs_1(0xb); 	break;
	case 0xbc: /* 1011 1100 */	f8_outs_1(0xc); 	break;
	case 0xbd: /* 1011 1101 */	f8_outs_1(0xd); 	break;
	case 0xbe: /* 1011 1110 */	f8_outs_1(0xe); 	break;
	case 0xbf: /* 1011 1111 */	f8_outs_1(0xf); 	break;

	case 0xc0: /* 1100 0000 */	f8_as(0x0); 		break;
	case 0xc1: /* 1100 0001 */	f8_as(0x1); 		break;
	case 0xc2: /* 1100 0010 */	f8_as(0x2); 		break;
	case 0xc3: /* 1100 0011 */	f8_as(0x3); 		break;
	case 0xc4: /* 1100 0100 */	f8_as(0x4); 		break;
	case 0xc5: /* 1100 0101 */	f8_as(0x5); 		break;
	case 0xc6: /* 1100 0110 */	f8_as(0x6); 		break;
	case 0xc7: /* 1100 0111 */	f8_as(0x7); 		break;
	case 0xc8: /* 1100 1000 */	f8_as(0x8); 		break;
	case 0xc9: /* 1100 1001 */	f8_as(0x9); 		break;
	case 0xca: /* 1100 1010 */	f8_as(0xa); 		break;
	case 0xcb: /* 1100 1011 */	f8_as(0xb); 		break;
	case 0xcc: /* 1100 1100 */	f8_as_isar(); 		break;
	case 0xcd: /* 1100 1101 */	f8_as_isar_i(); 	break;
	case 0xce: /* 1100 1110 */	f8_as_isar_d(); 	break;
	case 0xcf: /* 1100 1111 */	illegal(); 			break;

	case 0xd0: /* 1101 0000 */	f8_asd(0x0);		break;
	case 0xd1: /* 1101 0001 */	f8_asd(0x1);		break;
	case 0xd2: /* 1101 0010 */	f8_asd(0x2);		break;
	case 0xd3: /* 1101 0011 */	f8_asd(0x3);		break;
	case 0xd4: /* 1101 0100 */	f8_asd(0x4);		break;
	case 0xd5: /* 1101 0101 */	f8_asd(0x5);		break;
	case 0xd6: /* 1101 0110 */	f8_asd(0x6);		break;
	case 0xd7: /* 1101 0111 */	f8_asd(0x7);		break;
	case 0xd8: /* 1101 1000 */	f8_asd(0x8);		break;
	case 0xd9: /* 1101 1001 */	f8_asd(0x9);		break;
	case 0xda: /* 1101 1010 */	f8_asd(0xa);		break;
	case 0xdb: /* 1101 1011 */	f8_asd(0xb);		break;
	case 0xdc: /* 1101 1100 */	f8_asd_isar();		break;
	case 0xdd: /* 1101 1101 */	f8_asd_isar_i();	break;
	case 0xde: /* 1101 1110 */	f8_asd_isar_d();	break;
	case 0xdf: /* 1101 1111 */	illegal();			break;

	case 0xe0: /* 1110 0000 */	f8_xs(0x0); 		break;
	case 0xe1: /* 1110 0001 */	f8_xs(0x1); 		break;
	case 0xe2: /* 1110 0010 */	f8_xs(0x2); 		break;
	case 0xe3: /* 1110 0011 */	f8_xs(0x3); 		break;
	case 0xe4: /* 1110 0100 */	f8_xs(0x4); 		break;
	case 0xe5: /* 1110 0101 */	f8_xs(0x5); 		break;
	case 0xe6: /* 1110 0110 */	f8_xs(0x6); 		break;
	case 0xe7: /* 1110 0111 */	f8_xs(0x7); 		break;
	case 0xe8: /* 1110 1000 */	f8_xs(0x8); 		break;
	case 0xe9: /* 1110 1001 */	f8_xs(0x9); 		break;
	case 0xea: /* 1110 1010 */	f8_xs(0xa); 		break;
	case 0xeb: /* 1110 1011 */	f8_xs(0xb); 		break;
	case 0xec: /* 1110 1100 */	f8_xs_isar();		break;
	case 0xed: /* 1110 1101 */	f8_xs_isar_i();		break;
	case 0xee: /* 1110 1110 */	f8_xs_isar_d();		break;
	case 0xef: /* 1110 1111 */	illegal();			break;

	case 0xf0: /* 1111 0000 */	f8_ns(0x0); 		break;
	case 0xf1: /* 1111 0001 */	f8_ns(0x1); 		break;
	case 0xf2: /* 1111 0010 */	f8_ns(0x2); 		break;
	case 0xf3: /* 1111 0011 */	f8_ns(0x3); 		break;
	case 0xf4: /* 1111 0100 */	f8_ns(0x4); 		break;
	case 0xf5: /* 1111 0101 */	f8_ns(0x5); 		break;
	case 0xf6: /* 1111 0110 */	f8_ns(0x6); 		break;
	case 0xf7: /* 1111 0111 */	f8_ns(0x7); 		break;
	case 0xf8: /* 1111 1000 */	f8_ns(0x8); 		break;
	case 0xf9: /* 1111 1001 */	f8_ns(0x9); 		break;
	case 0xfa: /* 1111 1010 */	f8_ns(0xa); 		break;
	case 0xfb: /* 1111 1011 */	f8_ns(0xb); 		break;
	case 0xfc: /* 1111 1100 */	f8_ns_isar();		break;
	case 0xfd: /* 1111 1101 */	f8_ns_isar_i();		break;
	case 0xfe: /* 1111 1110 */	f8_ns_isar_d();		break;
	case 0xff: /* 1111 1111 */	illegal();			break;
        }
	switch (op) {
	case 0x0d:case 0x1b:case 0x1c:case 0x1d:
	case 0x27:case 0x28:case 0x29:
	case 0xb4:case 0xb5:case 0xb6:case 0xb7:
	case 0xb8:case 0xb9:case 0xba:case 0xbb:
	case 0xbc:case 0xbd:case 0xbe:case 0xbf:
	    ROMC_00(cS);
	    break;
	default:
	    if (f8.w&I && f8.irq_request) {
		ROMC_1C(cL);
		ROMC_0F();
		ROMC_13();
	    }
	    if((op>=0x30)&&(op<=0x3f))	/* SKR - DS is a long cycle inst */
	    	ROMC_00(cL);
	    else
		    ROMC_00(cS);
	    break;
	}

    } while( f8_icount > 0 );

    return cycles - f8_icount;
}

static void f8_get_context (void *dst)
{
	if (dst)
		*(f8_Regs *) dst = f8;
}

static void f8_set_context (void *src)
{
	if (src)
		f8 = *(f8_Regs *) src;
}

#ifdef MAME_DEBUG
unsigned DasmF8( char *dst, unsigned pc );
#endif

unsigned f8_dasm(char *buffer, unsigned pc)
{
#ifdef MAME_DEBUG
	return DasmF8( buffer, pc );
#else
	sprintf( buffer, "$%02X", cpu_readop(pc) );
	return 1;
#endif
}

void f8_init (void) { }

static void f8_set_info(UINT32 state, union cpuinfo *info)
{
	switch (state)
	{
	/* --- the following bits of info are returned as 64-bit signed integers --- */
	case CPUINFO_INT_SP:			f8.pc1 = info->i;						break;
	case CPUINFO_INT_PC:
		f8.pc0 = info->i;
		f8.dbus = cpu_readop(f8.pc0);
    	f8.pc0 += 1;
  		break;
	case CPUINFO_INT_PREVIOUSPC:	break;	/* TODO? */
	case CPUINFO_INT_INPUT_STATE:		f8.irq_request = info->i;				break;
	case CPUINFO_INT_REGISTER + F8_PC0:
		f8.pc0 = info->i;
		f8.dbus = cpu_readop(f8.pc0);
    	f8.pc0 += 1;
		break;
	case CPUINFO_INT_REGISTER + F8_PC1: f8.pc1 = info->i; break;
	case CPUINFO_INT_REGISTER + F8_DC0: f8.dc0 = info->i; break;
	case CPUINFO_INT_REGISTER + F8_DC1: f8.dc1 = info->i; break;
	case CPUINFO_INT_REGISTER + F8_W:	f8.w = info->i; break;
	case CPUINFO_INT_REGISTER + F8_A:	f8.a = info->i; break;
	case CPUINFO_INT_REGISTER + F8_IS:  f8.is = info->i & 0x3f; break;
	case CPUINFO_INT_REGISTER + F8_J:	f8.r[ 9] = info->i; break;
	case CPUINFO_INT_REGISTER + F8_HU:  f8.r[10] = info->i; break;
	case CPUINFO_INT_REGISTER + F8_HL:  f8.r[11] = info->i; break;
	case CPUINFO_INT_REGISTER + F8_KU:  f8.r[12] = info->i; break;
	case CPUINFO_INT_REGISTER + F8_KL:  f8.r[13] = info->i; break;
	case CPUINFO_INT_REGISTER + F8_QU:  f8.r[14] = info->i; break;
	case CPUINFO_INT_REGISTER + F8_QL:  f8.r[15] = info->i; break;

	case CPUINFO_INT_REGISTER + F8_R0:
	case CPUINFO_INT_REGISTER + F8_R1:
	case CPUINFO_INT_REGISTER + F8_R2:
	case CPUINFO_INT_REGISTER + F8_R3:
	case CPUINFO_INT_REGISTER + F8_R4:
	case CPUINFO_INT_REGISTER + F8_R5:
	case CPUINFO_INT_REGISTER + F8_R6:
	case CPUINFO_INT_REGISTER + F8_R7:
	case CPUINFO_INT_REGISTER + F8_R8:
		f8.r[state - (CPUINFO_INT_REGISTER + F8_R0)]=info->i;
		break;

	case CPUINFO_INT_REGISTER + F8_R16:
	case CPUINFO_INT_REGISTER + F8_R17:
	case CPUINFO_INT_REGISTER + F8_R18:
	case CPUINFO_INT_REGISTER + F8_R19:
	case CPUINFO_INT_REGISTER + F8_R20:
	case CPUINFO_INT_REGISTER + F8_R21:
	case CPUINFO_INT_REGISTER + F8_R22:
	case CPUINFO_INT_REGISTER + F8_R23:
	case CPUINFO_INT_REGISTER + F8_R24:
	case CPUINFO_INT_REGISTER + F8_R25:
	case CPUINFO_INT_REGISTER + F8_R26:
	case CPUINFO_INT_REGISTER + F8_R27:
	case CPUINFO_INT_REGISTER + F8_R28:
	case CPUINFO_INT_REGISTER + F8_R29:
	case CPUINFO_INT_REGISTER + F8_R30:
	case CPUINFO_INT_REGISTER + F8_R31:
	case CPUINFO_INT_REGISTER + F8_R32:
	case CPUINFO_INT_REGISTER + F8_R33:
	case CPUINFO_INT_REGISTER + F8_R34:
	case CPUINFO_INT_REGISTER + F8_R35:
	case CPUINFO_INT_REGISTER + F8_R36:
	case CPUINFO_INT_REGISTER + F8_R37:
	case CPUINFO_INT_REGISTER + F8_R38:
	case CPUINFO_INT_REGISTER + F8_R39:
	case CPUINFO_INT_REGISTER + F8_R40:
	case CPUINFO_INT_REGISTER + F8_R41:
	case CPUINFO_INT_REGISTER + F8_R42:
	case CPUINFO_INT_REGISTER + F8_R43:
	case CPUINFO_INT_REGISTER + F8_R44:
	case CPUINFO_INT_REGISTER + F8_R45:
	case CPUINFO_INT_REGISTER + F8_R46:
	case CPUINFO_INT_REGISTER + F8_R47:
	case CPUINFO_INT_REGISTER + F8_R48:
	case CPUINFO_INT_REGISTER + F8_R49:
	case CPUINFO_INT_REGISTER + F8_R50:
	case CPUINFO_INT_REGISTER + F8_R51:
	case CPUINFO_INT_REGISTER + F8_R52:
	case CPUINFO_INT_REGISTER + F8_R53:
	case CPUINFO_INT_REGISTER + F8_R54:
	case CPUINFO_INT_REGISTER + F8_R55:
	case CPUINFO_INT_REGISTER + F8_R56:
	case CPUINFO_INT_REGISTER + F8_R57:
	case CPUINFO_INT_REGISTER + F8_R58:
	case CPUINFO_INT_REGISTER + F8_R59:
	case CPUINFO_INT_REGISTER + F8_R60:
	case CPUINFO_INT_REGISTER + F8_R61:
	case CPUINFO_INT_REGISTER + F8_R62:
	case CPUINFO_INT_REGISTER + F8_R63:
		f8.r[state - (CPUINFO_INT_REGISTER + F8_R16) + 16]=info->i;
		break;

	/* --- the following bits of info are returned as pointers to data or functions --- */
	case CPUINFO_PTR_IRQ_CALLBACK:	f8.irq_callback = info->irqcallback;	break;
	}
	return;
}

void f8_get_info(UINT32 state, union cpuinfo *info)
{
	switch (state)
	{
	/* --- the following bits of info are returned as 64-bit signed integers --- */
	case CPUINFO_INT_CONTEXT_SIZE:					info->i = sizeof(f8_Regs);	break;
	case CPUINFO_INT_INPUT_LINES:						info->i = 1;			break;
	case CPUINFO_INT_DEFAULT_IRQ_VECTOR:			info->i = 0;			break;
	case CPUINFO_INT_ENDIANNESS:					info->i = CPU_IS_BE;	break;
	case CPUINFO_INT_CLOCK_DIVIDER:					info->i = 1;			break;
	case CPUINFO_INT_MIN_INSTRUCTION_BYTES:			info->i = 1;			break;
	case CPUINFO_INT_MAX_INSTRUCTION_BYTES:			info->i = 3;			break;
	case CPUINFO_INT_MIN_CYCLES:					info->i = 1;			break;
	case CPUINFO_INT_MAX_CYCLES:					info->i = 7;			break;

	case CPUINFO_INT_DATABUS_WIDTH + ADDRESS_SPACE_PROGRAM:	info->i = 8;	break;
	case CPUINFO_INT_ADDRBUS_WIDTH + ADDRESS_SPACE_PROGRAM: info->i = 16;	break;
	case CPUINFO_INT_ADDRBUS_SHIFT + ADDRESS_SPACE_PROGRAM: info->i = 0;	break;
	case CPUINFO_INT_DATABUS_WIDTH + ADDRESS_SPACE_DATA:	info->i = 0;	break;
	case CPUINFO_INT_ADDRBUS_WIDTH + ADDRESS_SPACE_DATA: 	info->i = 0;	break;
	case CPUINFO_INT_ADDRBUS_SHIFT + ADDRESS_SPACE_DATA: 	info->i = 0;	break;
	case CPUINFO_INT_DATABUS_WIDTH + ADDRESS_SPACE_IO:		info->i = 8;	break;
	case CPUINFO_INT_ADDRBUS_WIDTH + ADDRESS_SPACE_IO: 		info->i = 8;	break;
	case CPUINFO_INT_ADDRBUS_SHIFT + ADDRESS_SPACE_IO: 		info->i = 0;	break;

	case CPUINFO_INT_SP:				info->i = f8.pc1;					break;
	case CPUINFO_INT_PC:				info->i = (f8.pc0 - 1) & 0xffff;	break;
	case CPUINFO_INT_PREVIOUSPC:		info->i = 0;	/* TODO??? */		break;

	case CPUINFO_INT_INPUT_STATE:			info->i = f8.irq_request;			break;

	case CPUINFO_INT_REGISTER + F8_PC0:	info->i = (f8.pc0 - 1) & 0xffff;	break;
	case CPUINFO_INT_REGISTER + F8_PC1: info->i = f8.pc1;					break;
	case CPUINFO_INT_REGISTER + F8_DC0: info->i = f8.dc0;					break;
	case CPUINFO_INT_REGISTER + F8_DC1: info->i = f8.dc1;					break;
    case CPUINFO_INT_REGISTER + F8_W: 	info->i = f8.w;						break;
	case CPUINFO_INT_REGISTER + F8_A: 	info->i = f8.a;						break;
	case CPUINFO_INT_REGISTER + F8_IS: 	info->i = f8.is;					break;
	case CPUINFO_INT_REGISTER + F8_J:	info->i = f8.r[ 9];					break;
	case CPUINFO_INT_REGISTER + F8_HU:  info->i = f8.r[10];					break;
	case CPUINFO_INT_REGISTER + F8_HL:  info->i = f8.r[11];					break;
	case CPUINFO_INT_REGISTER + F8_KU:  info->i = f8.r[12];					break;
	case CPUINFO_INT_REGISTER + F8_KL:  info->i = f8.r[13];					break;
	case CPUINFO_INT_REGISTER + F8_QU:  info->i = f8.r[14];					break;
	case CPUINFO_INT_REGISTER + F8_QL:  info->i = f8.r[15];					break;

    case CPUINFO_INT_REGISTER + F8_R0:
    case CPUINFO_INT_REGISTER + F8_R1:
    case CPUINFO_INT_REGISTER + F8_R2:
    case CPUINFO_INT_REGISTER + F8_R3:
    case CPUINFO_INT_REGISTER + F8_R4:
    case CPUINFO_INT_REGISTER + F8_R5:
    case CPUINFO_INT_REGISTER + F8_R6:
    case CPUINFO_INT_REGISTER + F8_R7:
    case CPUINFO_INT_REGISTER + F8_R8:
    	info->i = f8.r[state - (CPUINFO_INT_REGISTER + F8_R0)];	break;


    case CPUINFO_INT_REGISTER + F8_R16:
    case CPUINFO_INT_REGISTER + F8_R17:
    case CPUINFO_INT_REGISTER + F8_R18:
    case CPUINFO_INT_REGISTER + F8_R19:
    case CPUINFO_INT_REGISTER + F8_R20:
    case CPUINFO_INT_REGISTER + F8_R21:
    case CPUINFO_INT_REGISTER + F8_R22:
    case CPUINFO_INT_REGISTER + F8_R23:
    case CPUINFO_INT_REGISTER + F8_R24:
    case CPUINFO_INT_REGISTER + F8_R25:
    case CPUINFO_INT_REGISTER + F8_R26:
    case CPUINFO_INT_REGISTER + F8_R27:
    case CPUINFO_INT_REGISTER + F8_R28:
    case CPUINFO_INT_REGISTER + F8_R29:
    case CPUINFO_INT_REGISTER + F8_R30:
    case CPUINFO_INT_REGISTER + F8_R31:
    case CPUINFO_INT_REGISTER + F8_R32:
    case CPUINFO_INT_REGISTER + F8_R33:
    case CPUINFO_INT_REGISTER + F8_R34:
    case CPUINFO_INT_REGISTER + F8_R35:
    case CPUINFO_INT_REGISTER + F8_R36:
    case CPUINFO_INT_REGISTER + F8_R37:
    case CPUINFO_INT_REGISTER + F8_R38:
    case CPUINFO_INT_REGISTER + F8_R39:
    case CPUINFO_INT_REGISTER + F8_R40:
    case CPUINFO_INT_REGISTER + F8_R41:
    case CPUINFO_INT_REGISTER + F8_R42:
    case CPUINFO_INT_REGISTER + F8_R43:
    case CPUINFO_INT_REGISTER + F8_R44:
    case CPUINFO_INT_REGISTER + F8_R45:
    case CPUINFO_INT_REGISTER + F8_R46:
    case CPUINFO_INT_REGISTER + F8_R47:
    case CPUINFO_INT_REGISTER + F8_R48:
    case CPUINFO_INT_REGISTER + F8_R49:
    case CPUINFO_INT_REGISTER + F8_R50:
    case CPUINFO_INT_REGISTER + F8_R51:
    case CPUINFO_INT_REGISTER + F8_R52:
    case CPUINFO_INT_REGISTER + F8_R53:
    case CPUINFO_INT_REGISTER + F8_R54:
    case CPUINFO_INT_REGISTER + F8_R55:
    case CPUINFO_INT_REGISTER + F8_R56:
    case CPUINFO_INT_REGISTER + F8_R57:
    case CPUINFO_INT_REGISTER + F8_R58:
    case CPUINFO_INT_REGISTER + F8_R59:
    case CPUINFO_INT_REGISTER + F8_R60:
    case CPUINFO_INT_REGISTER + F8_R61:
    case CPUINFO_INT_REGISTER + F8_R62:
    case CPUINFO_INT_REGISTER + F8_R63:
    	info->i = f8.r[state - (CPUINFO_INT_REGISTER + F8_R16) + 16];	break;

	/* --- the following bits of info are returned as pointers to data or functions --- */
	case CPUINFO_PTR_SET_INFO:						info->setinfo = f8_set_info;			break;
	case CPUINFO_PTR_GET_CONTEXT:					info->getcontext = f8_get_context;		break;
	case CPUINFO_PTR_SET_CONTEXT:					info->setcontext = f8_set_context;		break;
	case CPUINFO_PTR_INIT:							info->init = f8_init;					break;
	case CPUINFO_PTR_RESET:							info->reset = f8_reset;					break;
	case CPUINFO_PTR_EXIT:							info->exit = f8_exit;					break;
	case CPUINFO_PTR_EXECUTE:						info->execute = f8_execute;				break;
	case CPUINFO_PTR_BURN:							info->burn = NULL;						break;

	case CPUINFO_PTR_DISASSEMBLE:					info->disassemble = f8_dasm;			break;
	case CPUINFO_PTR_IRQ_CALLBACK:					info->irqcallback = f8.irq_callback;	break;
	case CPUINFO_PTR_INSTRUCTION_COUNTER:			info->icount = &f8_icount;				break;
	case CPUINFO_PTR_REGISTER_LAYOUT:				info->p = f8_reg_layout;				break;
	case CPUINFO_PTR_WINDOW_LAYOUT:					info->p = f8_win_layout;				break;

	/* --- the following bits of info are returned as NULL-terminated strings --- */
	case CPUINFO_STR_NAME: 			strcpy(info->s = cpuintrf_temp_str(), "F8");			break;
	case CPUINFO_STR_CORE_FAMILY:	strcpy(info->s = cpuintrf_temp_str(), "Fairchild F8");	break;
	case CPUINFO_STR_CORE_VERSION:	strcpy(info->s = cpuintrf_temp_str(), "1.0");			break;
	case CPUINFO_STR_CORE_FILE:		strcpy(info->s = cpuintrf_temp_str(), __FILE__);		break;
	case CPUINFO_STR_CORE_CREDITS:	strcpy(info->s = cpuintrf_temp_str(),
									"Copyright (c) 2000 Juergen Buchmueller, all rights reserved.");
									break;

    case CPUINFO_STR_FLAGS:
			sprintf(info->s = cpuintrf_temp_str(), "%c%c%c%c%c",
				f8.w & 0x10 ? 'I':'.',
				f8.w & 0x08 ? 'O':'.',
				f8.w & 0x04 ? 'Z':'.',
				f8.w & 0x02 ? 'C':'.',
				f8.w & 0x01 ? 'S':'.');
			break;

	case CPUINFO_STR_REGISTER+F8_PC0:sprintf(info->s = cpuintrf_temp_str(), "PC0:%04X", ((f8.pc0) - 1) & 0xffff); break;
	case CPUINFO_STR_REGISTER+F8_PC1:sprintf(info->s = cpuintrf_temp_str(), "PC1:%04X", f8.pc1); break;
	case CPUINFO_STR_REGISTER+F8_DC0:sprintf(info->s = cpuintrf_temp_str(), "DC0:%04X", f8.dc0); break;
	case CPUINFO_STR_REGISTER+F8_DC1:sprintf(info->s = cpuintrf_temp_str(), "DC1:%04X", f8.dc1); break;
	case CPUINFO_STR_REGISTER+F8_W:  sprintf(info->s = cpuintrf_temp_str(), "W  :%02X", f8.w); break;
	case CPUINFO_STR_REGISTER+F8_A:  sprintf(info->s = cpuintrf_temp_str(), "A  :%02X", f8.a); break;
	case CPUINFO_STR_REGISTER+F8_IS: sprintf(info->s = cpuintrf_temp_str(), "IS :%02X", f8.is); break;
	case CPUINFO_STR_REGISTER+F8_J:  sprintf(info->s = cpuintrf_temp_str(), "J  :%02X", f8.r[9]); break;
	case CPUINFO_STR_REGISTER+F8_HU: sprintf(info->s = cpuintrf_temp_str(), "HU :%02X", f8.r[10]); break;
	case CPUINFO_STR_REGISTER+F8_HL: sprintf(info->s = cpuintrf_temp_str(), "HL :%02X", f8.r[11]); break;
	case CPUINFO_STR_REGISTER+F8_KU: sprintf(info->s = cpuintrf_temp_str(), "KU :%02X", f8.r[12]); break;
	case CPUINFO_STR_REGISTER+F8_KL: sprintf(info->s = cpuintrf_temp_str(), "KL :%02X", f8.r[13]); break;
	case CPUINFO_STR_REGISTER+F8_QU: sprintf(info->s = cpuintrf_temp_str(), "QU :%02X", f8.r[14]); break;
	case CPUINFO_STR_REGISTER+F8_QL: sprintf(info->s = cpuintrf_temp_str(), "QL :%02X", f8.r[15]); break;
	case CPUINFO_STR_REGISTER+F8_R0: sprintf(info->s = cpuintrf_temp_str(), "R0 :%02X", f8.r[0]); break;
	case CPUINFO_STR_REGISTER+F8_R1: sprintf(info->s = cpuintrf_temp_str(), "R1 :%02X", f8.r[1]); break;
	case CPUINFO_STR_REGISTER+F8_R2: sprintf(info->s = cpuintrf_temp_str(), "R2 :%02X", f8.r[2]); break;
	case CPUINFO_STR_REGISTER+F8_R3: sprintf(info->s = cpuintrf_temp_str(), "R3 :%02X", f8.r[3]); break;
	case CPUINFO_STR_REGISTER+F8_R4: sprintf(info->s = cpuintrf_temp_str(), "R4 :%02X", f8.r[4]); break;
	case CPUINFO_STR_REGISTER+F8_R5: sprintf(info->s = cpuintrf_temp_str(), "R5 :%02X", f8.r[5]); break;
	case CPUINFO_STR_REGISTER+F8_R6: sprintf(info->s = cpuintrf_temp_str(), "R6 :%02X", f8.r[6]); break;
	case CPUINFO_STR_REGISTER+F8_R7: sprintf(info->s = cpuintrf_temp_str(), "R7 :%02X", f8.r[7]); break;
	case CPUINFO_STR_REGISTER+F8_R8: sprintf(info->s = cpuintrf_temp_str(), "R8 :%02X", f8.r[8]); break;
	case CPUINFO_STR_REGISTER+F8_R16: sprintf(info->s = cpuintrf_temp_str(), "R16 :%02X", f8.r[16]); break;
	case CPUINFO_STR_REGISTER+F8_R17: sprintf(info->s = cpuintrf_temp_str(), "R17 :%02X", f8.r[17]); break;
	case CPUINFO_STR_REGISTER+F8_R18: sprintf(info->s = cpuintrf_temp_str(), "R18 :%02X", f8.r[18]); break;
	case CPUINFO_STR_REGISTER+F8_R19: sprintf(info->s = cpuintrf_temp_str(), "R19 :%02X", f8.r[19]); break;
	case CPUINFO_STR_REGISTER+F8_R20: sprintf(info->s = cpuintrf_temp_str(), "R20 :%02X", f8.r[20]); break;
	case CPUINFO_STR_REGISTER+F8_R21: sprintf(info->s = cpuintrf_temp_str(), "R21 :%02X", f8.r[21]); break;
	case CPUINFO_STR_REGISTER+F8_R22: sprintf(info->s = cpuintrf_temp_str(), "R22 :%02X", f8.r[22]); break;
	case CPUINFO_STR_REGISTER+F8_R23: sprintf(info->s = cpuintrf_temp_str(), "R23 :%02X", f8.r[23]); break;
	case CPUINFO_STR_REGISTER+F8_R24: sprintf(info->s = cpuintrf_temp_str(), "R24 :%02X", f8.r[24]); break;
	case CPUINFO_STR_REGISTER+F8_R25: sprintf(info->s = cpuintrf_temp_str(), "R25 :%02X", f8.r[25]); break;
	case CPUINFO_STR_REGISTER+F8_R26: sprintf(info->s = cpuintrf_temp_str(), "R26 :%02X", f8.r[26]); break;
	case CPUINFO_STR_REGISTER+F8_R27: sprintf(info->s = cpuintrf_temp_str(), "R27 :%02X", f8.r[27]); break;
	case CPUINFO_STR_REGISTER+F8_R28: sprintf(info->s = cpuintrf_temp_str(), "R28 :%02X", f8.r[28]); break;
	case CPUINFO_STR_REGISTER+F8_R29: sprintf(info->s = cpuintrf_temp_str(), "R29 :%02X", f8.r[29]); break;
	case CPUINFO_STR_REGISTER+F8_R30: sprintf(info->s = cpuintrf_temp_str(), "R30 :%02X", f8.r[30]); break;
	case CPUINFO_STR_REGISTER+F8_R31: sprintf(info->s = cpuintrf_temp_str(), "R31 :%02X", f8.r[31]); break;
	case CPUINFO_STR_REGISTER+F8_R32: sprintf(info->s = cpuintrf_temp_str(), "R32 :%02X", f8.r[32]); break;
	case CPUINFO_STR_REGISTER+F8_R33: sprintf(info->s = cpuintrf_temp_str(), "R33 :%02X", f8.r[33]); break;
	case CPUINFO_STR_REGISTER+F8_R34: sprintf(info->s = cpuintrf_temp_str(), "R34 :%02X", f8.r[34]); break;
	case CPUINFO_STR_REGISTER+F8_R35: sprintf(info->s = cpuintrf_temp_str(), "R35 :%02X", f8.r[35]); break;
	case CPUINFO_STR_REGISTER+F8_R36: sprintf(info->s = cpuintrf_temp_str(), "R36 :%02X", f8.r[36]); break;
	case CPUINFO_STR_REGISTER+F8_R37: sprintf(info->s = cpuintrf_temp_str(), "R37 :%02X", f8.r[37]); break;
	case CPUINFO_STR_REGISTER+F8_R38: sprintf(info->s = cpuintrf_temp_str(), "R38 :%02X", f8.r[38]); break;
	case CPUINFO_STR_REGISTER+F8_R39: sprintf(info->s = cpuintrf_temp_str(), "R39 :%02X", f8.r[39]); break;
	case CPUINFO_STR_REGISTER+F8_R40: sprintf(info->s = cpuintrf_temp_str(), "R40 :%02X", f8.r[40]); break;
	case CPUINFO_STR_REGISTER+F8_R41: sprintf(info->s = cpuintrf_temp_str(), "R41 :%02X", f8.r[41]); break;
	case CPUINFO_STR_REGISTER+F8_R42: sprintf(info->s = cpuintrf_temp_str(), "R42 :%02X", f8.r[42]); break;
	case CPUINFO_STR_REGISTER+F8_R43: sprintf(info->s = cpuintrf_temp_str(), "R43 :%02X", f8.r[43]); break;
	case CPUINFO_STR_REGISTER+F8_R44: sprintf(info->s = cpuintrf_temp_str(), "R44 :%02X", f8.r[44]); break;
	case CPUINFO_STR_REGISTER+F8_R45: sprintf(info->s = cpuintrf_temp_str(), "R45 :%02X", f8.r[45]); break;
	case CPUINFO_STR_REGISTER+F8_R46: sprintf(info->s = cpuintrf_temp_str(), "R46 :%02X", f8.r[46]); break;
	case CPUINFO_STR_REGISTER+F8_R47: sprintf(info->s = cpuintrf_temp_str(), "R47 :%02X", f8.r[47]); break;
	case CPUINFO_STR_REGISTER+F8_R48: sprintf(info->s = cpuintrf_temp_str(), "R48 :%02X", f8.r[48]); break;
	case CPUINFO_STR_REGISTER+F8_R49: sprintf(info->s = cpuintrf_temp_str(), "R49 :%02X", f8.r[49]); break;
	case CPUINFO_STR_REGISTER+F8_R50: sprintf(info->s = cpuintrf_temp_str(), "R50 :%02X", f8.r[50]); break;
	case CPUINFO_STR_REGISTER+F8_R51: sprintf(info->s = cpuintrf_temp_str(), "R51 :%02X", f8.r[51]); break;
	case CPUINFO_STR_REGISTER+F8_R52: sprintf(info->s = cpuintrf_temp_str(), "R52 :%02X", f8.r[52]); break;
	case CPUINFO_STR_REGISTER+F8_R53: sprintf(info->s = cpuintrf_temp_str(), "R53 :%02X", f8.r[53]); break;
	case CPUINFO_STR_REGISTER+F8_R54: sprintf(info->s = cpuintrf_temp_str(), "R54 :%02X", f8.r[54]); break;
	case CPUINFO_STR_REGISTER+F8_R55: sprintf(info->s = cpuintrf_temp_str(), "R55 :%02X", f8.r[55]); break;
	case CPUINFO_STR_REGISTER+F8_R56: sprintf(info->s = cpuintrf_temp_str(), "R56 :%02X", f8.r[56]); break;
	case CPUINFO_STR_REGISTER+F8_R57: sprintf(info->s = cpuintrf_temp_str(), "R57 :%02X", f8.r[57]); break;
	case CPUINFO_STR_REGISTER+F8_R58: sprintf(info->s = cpuintrf_temp_str(), "R58 :%02X", f8.r[58]); break;
	case CPUINFO_STR_REGISTER+F8_R59: sprintf(info->s = cpuintrf_temp_str(), "R59 :%02X", f8.r[59]); break;
	case CPUINFO_STR_REGISTER+F8_R60: sprintf(info->s = cpuintrf_temp_str(), "R60 :%02X", f8.r[60]); break;
	case CPUINFO_STR_REGISTER+F8_R61: sprintf(info->s = cpuintrf_temp_str(), "R61 :%02X", f8.r[61]); break;
	case CPUINFO_STR_REGISTER+F8_R62: sprintf(info->s = cpuintrf_temp_str(), "R62 :%02X", f8.r[62]); break;
	case CPUINFO_STR_REGISTER+F8_R63: sprintf(info->s = cpuintrf_temp_str(), "R63 :%02X", f8.r[63]); break;

	}

	return;
}






