Has anyone seen this behaviour before on an MVS?
The error is BIOS Address A13 - A15. The ROM has good connectivity to the CPU. I am speculating the CPU might be the problem.
View attachment 51540
Just some questions, apologies if they seem silly.
- Is the Address error the same after a few reboots ? (i.e, always A13 - A15)
- What is the Error when using the stock Bios? -or- Uni-Bios?
- Are you testing with or without the test cart in the slot?
While I did not have the same exact error, I have seen garbage on screen before using the test bios and had a feeling there may have been a bad connection or cold solder joint. And while not recommended I did use my rework stations hot air tool to apply heat around the 68k / C1 / and RAM while the MVS was powered on, and I must have been lucky because it cleared up. But I don't recommend this since solder may flow/bridge a connection and while the board is powered up it could spell trouble. But hey I live dangerously sometimes.