So I think the Amiga 500 I was testing with has problems. I’m not sure precisely what or why but
Today, I dropped my new A501 replacement card into a known-working Commodore Amiga 500. It fired up immediately no issues with booting, everything worked, no wonkiness, memory tests passed 100%. This amiga has an accelerator card, and I was able to run 300 tests of pretty much the entire memory space on the card in about 5 minutes. Everything worked without error.
I’d like to get more data points here before I call it DONE, but it looks GREAT to me!
I’ve got to start putting up some more information, update the schematics with a few small fixes, and do some more testing.
Good milestone tonight!