Museum of the Game® & International Arcade Museum® Forums

Hello!

I have a MK2 board I "rescued" from the grave that's giving me the "CMOS CHIP U49 BAD" error message and does not hold any configuration.
It's presenting two "funny" glitches:
1) It will not enter the "game adjustments" section under the service menu.
2) It will not hold coin numbers after each versus battle
- often showing weird number like 1/255 or 30 (maximum reached) even though I didn't "insert" any new coin.

I changed the battery since the old one was measuring 2.8v to no success. Also, I can trace the 3.3v to the UH6 pin 1 successfully but the configuration are not being stored and the message persists at every boot.

I noticed the CMOS RAM chip at UJ11 (Sharp LH5268A-10LL) has some of its pins oxidized.
Pins 10 and 11 are slightly oxidized, and the pins 15 and 16 are heavily oxidized (tried co capture it on a picture but it doesn't show how it really is).


So I am looking for an equivalent for this IC since it's a 64k CMOS RAM (8k x 8).
Can I use a Toshiba TC5565APL-10 instead or any other else?

Thanks!