380Z Repair – Another try.

After a break of a couple of years I’ve decided its high time I had another go at repairing my RML-380Z. You can read about this machine and my previous attempts here.
A quick recap… 53e525645f5aa2c829d66d1d878e69f6
When I power the machine on I get a a fixed, pseudo random image on the screen but no other signs of life. I’ve re-seated chips in their sockets and swapped the RAM chips around the board but that’s about it.
It has been suggested that I swap matching logic chip to see if that gives any clues…

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