Amiga 600 Repair

SteveMoody · 18 September 2023, 15:40

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?

supaduper · 18 September 2023, 18:09

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

Boing-Ball · 18 September 2023, 22:49

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..

SteveMoody · 20 September 2023, 19:13

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.

18 September 2023, 15:40	#1
SteveMoody Registered User Join Date: Jan 2017 Location: South Wales Age: 50 Posts: 41	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?

18 September 2023, 18:09	#2
supaduper Registered User Join Date: Oct 2012 Location: Krypton Posts: 1,175	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.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Amiga Repair Help	weaponx031277	support.Hardware	3	23 October 2019 14:57
Amiga 2000 repair	Warlord	support.Hardware	3	28 October 2017 19:33
First Amiga 600 FPGA Accelerator - Vampire 600	majsta	Hardware mods	736	18 July 2016 18:31
Amiga Repair Services	brett71	support.Hardware	19	09 September 2012 22:13
Who Else Needs an Amiga Repair Shop	Zetr0	support.Hardware	8	29 November 2005 20:59

18 September 2023, 22:49	#3
Boing-Ball Registered User Join Date: Oct 2022 Location: United Kingdom Posts: 560	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..

20 September 2023, 19:13	#4
SteveMoody Registered User Join Date: Jan 2017 Location: South Wales Age: 50 Posts: 41	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.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)