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Hello, I checked my 3 CPU Boards Prom and all are the same as your 82S123-CPU.BIN

Hello, Here is a new rom dump of another CPU board REV C

Hello, This is a ROM read of REV D CPU BOARD

Hi Bruce, I actually made a crude harness to read those ROMS and it looks like it worked, or works better at least. I will repeat this method on the other two CPU board. About the B1, yes is was identical. I verified the ROM with the B1 image and no differences.

Hi, I could read the 8 ROMS on this CPU board REV F. Also: Here is another ROM I found in my collection. It actually is a BASIC 1 ROM chip on Motorola IC (ROM A). I have no idea where this came from.

I could see that one of my CPU boards have the exact same ROMS as in your list

I could identify 2 ROMS from the link you provided. I have attached zip file with what I could retrieve so far.

I think the ROMS or the dump is the cause of these files being incomplete.

Here is a new set. I did not compair with the previous set, so it is what it is.

Hello There, Interesting indeed. I will check the files again to check if I did not introduce any inconsistancies. Regards, Cliff

This reminds me of two projects, one for the SuperBrain Jr and the other for Altos 580. Both had power supply issues and fixing was not too obvious. I decided to replace the original power supply with common modern alternatives. Created simple adapter PCB for the original power connectors. Both...

Perfect break-out to test PSU Excellent and also to test outside the main unit.

Hi, Yes I agree. Once the power supply is working again, another chapter begins :)

Hello, I had the same thoughts about the over voltage situation. Try pull some 74 ic and test just to see how many are dead. Should give idea how far it went. Same for the RAM.

Can you take some pictures of your different PCBs

Were did you measure the 110v, it makes me nervous ⚡

Hello there, Normal procedure was to check diodes, transistors, resistors, shorts, visual and so on. I replaced all the caps due to the age of this equipment plus one tantalum at the edge connector, that was all. The voltages were all spot on now. This I repeated for all three and perfect...

Hello There, These are the power line voltages under normal operational load.

Just another topic. The CPU and Video PCB contain PROMS 82S123. I have save the data with an adapter.