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Old 18 September 2023, 15:40   #1
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Amiga 600 Repair

I wonder if anybody here can help with this problem I have with an Amiga 600 that I am trying to restore. The computer was working fine but I recapped it just to be on the safe side. Once that was done, computer still worked fine, could boot up to workbench.

This is where I managed to mess things up. I thought I would test it using DiagROM just to make sure that passed all it’s tests. When I plugged the EPROM in, I positioned it in the wrong place so instead of leaving the top 2 pins empty it was plugged into them. I noticed the problem fairly quickly but the EPROM was getting warm. Putting the EPROM back in the correct place in the socket, DiagROM runs without issue and the machine passes all tests without any error.

The problem I have now is that when I plug the ROM chip back in, the computer now fails to boot up. When starting I either get a black screen or occasionally a blue screen. The Blue screen seems to suggest a custom chip problem.

As DiagROM boots reliably I can’t believe there’s a major issue with the computer. I’m going to start tracing some of the signals to the chips to see if they look ok, just wondering if anyone here has seen this problem before?
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Old 18 September 2023, 18:09   #2
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Have you tried the Logica Diagnostic rom, it is included with the Amiga Forever rom set, so you could burn that to an EPROM and see if it will boot with that and that will give a read out of some your custom chips

Last edited by supaduper; 18 September 2023 at 18:24.
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Old 18 September 2023, 22:49   #3
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Are you sure you have plugged the original ROM chips in correctly? What you describe could also mean the ROM chip is not seated correctly into the socket…

Check for bent pins on the ROM itself..
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Old 20 September 2023, 19:13   #4
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Thanks supaduper, I've not seen this one. Will try the Logica Diagnostic ROM and see if that shows anything different. Will be nice if this gives me an idea where to look.

Boing-Ball, part of the problem may have been my overconfidence as an electronics engineer that I would never design a board with a wrong sized socket on there. I didn't even notice the socket was different size until after I made a a mistake. Original ROM IC seems OK and fits in socket well.
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