Apple Pugetsound Program Library Exchange (A.P.P.L.E.) has updated the manual for the popular Apple II graphics programming tool Turtlesoft with a new softcover manual. Originally published in 1983 by A.P.P.L.E., the new manual features revised formatting and now includes the 15 sample programs with screenshots.
In addition to the original Turtlesoft DOS 3.3 version by Robert Gallup, John Brooks recently converted it to work with ProDOS. Both Turtlesoft disk images are available as a benefit exclusively for A.P.P.L.E. members. Besides Turtlesoft, the disk images also include the sample programs.
Imagine you have a robot turtle. You might think that rather strange, but try to imagine it anyway. Imagine that this “turtle” can move around the floor in response to commands you give it such as: FORWARD and BACK, which tells the turtle to move forward or backward a certain number of steps, and RIGHT and LEFT which tells the turtle to turn a certain amount right or left.
As the turtle moves, it leaves a trail you can see. By giving the turtle the right commands, you can have it draw any shape you want.
Voila! You have Turtle graphics. Your computer screen is the floor and the turtle is a triangle visible on it.
As you experiment with trying to draw shapes using Turtle graphics you may find that thinking in “Turtle talk” is much easier for many things than thinking in the “coordinate talk” of normal graphics.
• 25 instructions (primitives) for controlling the turtle
• Sound routine with Turtle graphics
• Uses both Hi-Res screens
• Create your own command names
• Descriptive error messages for easy program debugging
• Error messages can be processed using ONERR
• Commands accessed through ampersand for use within a program
• Available for both DOS 3.3 and ProDOS
• Runs on all Apple II computers
Brian Wiser — Apple consultant, historian and archivist. Designer, editor, and co-producer of several books including Nibble Viewpoints, The WOZPAK Special Edition, and What’s Where in the Apple: Enhanced Edition. Producer/Director of the documentary film Done The Impossible: The Fans’ Tale of Firefly & Serenity, Beagle Bros and Applied Engineering webmaster. Brian also co-produced the retro iOS game Structris, and is a co-producer/writer for CallApple.org and Call-A.P.P.L.E. magazine.
Bill Martens — Apple historian and enthusiast, Programmer, President of Apple Pugetsound Program Library Exchange (A.P.P.L.E.) and co-producer of Call-A.P.P.L.E. magazine, Nibble Viewpoints, The WOZPAK Special Edition, and What’s Where in the Apple: Enhanced Edition. Bill also co-produced the retro iOS game Structris.
Apple Pugetsound Program Library Exchange (A.P.P.L.E.) has been a global Apple user group since 1978, with membership peaking near 50,000 in 1985. Offering many services, A.P.P.L.E. is also a book publisher and game developer. In 2013, the “The WOZPAK Special Edition” book was released containing Steve Wozniak’s restored hand-written notes and printouts about his Apple II computer, as well as a forward from Steve Wozniak and other Apple legends.
Press Information is available at: www.callapple.org/press