The APPLE-II color graphics hardware will display a 40H by 48V grid, each position of which may be anyone of 16 colors. The actual screen data is stored in 1 K bytes of system memory, normally locations $400 to $7FF.(A dual page mode allows the user to alternatively display locations $800 to $BFF). Color displays […]
Category: Assembly Language
If you have a newer Apple with the silent keyboard, Don Williams has written a short and sweet machine language routine to solve your problem. 0300: 48 PHA 0301 : A9 20 LDA #$20 0303: 8D 30 CO STA $C030 0306: 20 A8 FC JSR $FCA8 0309: 8D 30 CO STA $C030 030C: 68 PLA […]
The Assembly Language classes are now scheduled to start June 1 at Empire Electronics. Cost $35 per persorn including Synertek manual. To sign up, call Tom Geer at (206)244-5200 or Don Williams at (206)242-6807. The course includes Number Systems, Boolean Algebra, 6502 Instruction set and Programming.
By Bob Huelsdonk I wrote this simple program to test new memory chips I bought. Just store the correct end address for your Apple in locations 4 and 5, run 300G and display 800 to the end. 300.32A 0300- A0 00 A9 55 91 02 D1 02 0308- D0 1D A9 AA 91 02 D1 […]