Steve writes: FPGA-based disk control for Apple II is finally working! Six months ago, I began designing a universal disk controller card for the Apple II family. Apple made a bewildering number of different disk controller cards in the 1970s and 80s, and my hope was to replace the IWM chip (Integrated Wozniak Machine) and […]
Tag Archives: Apple II
Yellowstone JTAG debugging
A follow-up to the FPGA-based disk controller for Apple II post, Steve writes: After a month of inactivity, I finally returned to my unfinished Yellowstone disk controller project to investigate the JTAG programming problems. Yellowstone is an FPGA-based disk controller card for the Apple II family, that aims to emulate a Liron disk controller or other models […]
Apple II DOS source code available
Could you write a Disk Operating System in 7 weeks? That was the time frame in which the Apple II DOS was developed! According to the Computer History Museum, “On April 10, 1978 Bob Shepardson and Steve Jobs signed a $13,000 one-page contract for a file manager, a BASIC interface, and utilities. It specified that […]