What kind of eproms are you using, and are your jumpers set correctly?
(Topic ID: 237706)
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I may be crazy, but it looks like the chips in U9 and U10 are swapped.
Someone else please correct me if I'm wrong, but from what I can find that F6820P is the CPU https://www.datasheets360.com/part/detail/f6820p/-1546086776156623257/
And the two 620-29's are the PIAs
So I was only a little crazy. I believe the 620-28 is the Bally 6800 CPU.
If you don't have a 6800 CPU you aren't going anywhere.
Quoted from Sonora70:Tested the board. No change.
Try pulling U10 as well, I had a board that locked solid like that when U10 was bad.
That is a bummer, not that I have any expertise, but unfortunately what limited knowledge I do have is running out. Your board is jumpered correctly for the roms and you now have as far as I can tell the correct chips in the right place.
Do you know the roms you have in the board are good? To get a board to start to boot I believe you only need U6 in. Are you sure those are working roms?
Quoted from Sonora70:Took all the chips out of another board.....no luck. Should I rebuild the reset section? It looks clean.
It is starting to look that way.
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