In order to properly reverse engineer a PAL, you need to correctly identify which pins are inputs, and which pins are outputs. This in some cases is trivial because some of the PAL’s pin functions are fixed...
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Amiga A501 Replacement
Schematics now available for A501 replacement card
Schematics now available for A501 replacement card!
Find them on the main project page, located here.
Added some new photos for A501 replacement
Added some new photos of the populated PCB for the Commodore Amiga A501 memory replacement card.
Find them on the main project page here.
Cause of original instability and boot problems on the original A500 identified
So the very first A500 I had been testing on since the beginning of the project had a Bug Katcher installed. It turns out that I wasn’t really using it, but I left it plugged in anyways. I’m not sure...
Sweet success, card works 100% in different DUT(Amiga)
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...
Logic Analyzer probe loading seems to fix boot issue
While I had my logic analyzer connected to my memory card tonight, I noticed that I no longer had the white screen hang on bootup problem that I’ve been plagued with since this card came in. As a matter of fact...
Stress testing the memory board
So I’ve written some assembly in the monitor software I’ve been using, and I’ve just created a large loop to see if I can get the card to fail. I’m still having plenty of problems on bootup, but...
