I’m still working on the design for an automated Yellowstone tester. The general idea is to use an STM32 microcontroller that’s connected to all the Yellowstone board’s I/O signals, then drive the inputs in various combinations and verify the outputs.…
Here’s a brief follow-up about the classic Macintosh game Dark Castle, which I mentioned a few weeks ago in connection with some possible disk emulation bugs. This game originally shipped on two 400K floppy disks. At the intro screen shown…
The Yellowstone Smartport problems that I discussed last week should all be resolved now. Small fixes to big problems. As usual the main challenge was determining exactly what the problem was and how to reproduce it. After that, the fix…
Whoops! I’ve discovered a basic flaw with the Yellowstone disk controller design: when an intelligent Smartport drive is connected in parallel with a 3.5 inch or 5.25 inch drive, the Smartport drive may be inadvertently enabled or reset as a…
Yellowstone PCB version 2.2 is ready to be sent for fabrication. This is the fourth and hopefully finally PCB version, coming after 1.0, 2.0, and 2.1. But I also thought 2.1 would be the final version, so my powers of…
With Yellowstone hardware development hopefully approaching completion, I’ve started thinking more about the design for an automated tester. As long as I’m hand-assembling one board at a time, I can throw it in my Apple IIe and try exercising some…
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