Troubleshooting a Disk II controller card (part 2)

With the Disk II controller card in (hopefully) working condition, it was time to move on to the main part of this project: build an emulated disk drive using a Raspberry Pi Pico. I had a rough idea on how to do it: The Disk II is a 5V device, while the Pico is 3.3V, …

Troubleshooting a Disk II controller card (part 1)

This is my attempt to troubleshoot the Disk II controller card of my Apple //e clone. This computer was bought in 1986 and has been sitting on a shelf for 30+ years. A few years ago I performed a fairly complete restoration, including the case, motherboard, power source, and keyboard. The computer boots OK, but …