Electronics > Repair
What more i can do?
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222Lab_Test222:

--- Quote from: radiolistener on October 30, 2024, 06:18:00 am ---since it is very old, it is possible that ROM chips are loss their information, so the beep may be a signal that ROM checksum is failed

--- End quote ---

How can i verify that?
Harry_22:
Try to access the Bios on working machine by the delete key, F1, F2, ctrl-alt-s, ctrl-alt-up arrow (or down), etc.
222Lab_Test222:

--- Quote from: Harry_22 on October 30, 2024, 07:17:46 am ---Try to access the Bios on working machine by the delete key, F1, F2, ctrl-alt-s, ctrl-alt-up arrow (or down), etc.

--- End quote ---

this is controller of a machine NOT a motherboard of PC, i am not sure how to press those.
HarryDoPECC:
Remove and dump EPROMs, compare Good and bad systems?

That said, my hobby involves UVEPROMs that are now 40-50 years old and I’m impressed by how very well they seem to retain data

But not too hard to dump and compare, and at least you get backups
Harry_22:

--- Quote from: 222Lab_Test222 on October 30, 2024, 07:27:31 am ---this is controller of a machine NOT a motherboard of PC, i am not sure how to press those.

--- End quote ---

There must be some MMI to setup clock.
Could you take a photo of the right side connectors?
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