Hi all,
Was hoping I could get some direction on an odd Gottlieb Monty Carlo (system 80B) memory loss issue. First off game plays great, MPU is in very good condition, and has a memory cap.. Problem is if game is turned off even for a second, high scores are erased, along with credit count. I have verified cap is installed correctly, it is fully charged (output voltage 24hrs after game is turned off is 4.5vdc). I also checked voltages at all (VB) batt. powered points (based off schematics)with game off and the 4-5 ICs are getting the (VB) voltage. Also after a short time of playing I noticed that some of the high score initials turn from letters to odd symbols.
I would guess one of the memory ICs is bad, but how to figure which one, I am at a loss.
Thanks for any ideas
Aaron

Thanks for the reply, the memory test passes(OK). Out of all the possible ICs, the RAM was at the top of my gut feeling suspect list. This is a friends game he just got, and was helping him out.
On a side note my (4) system 80 games have your NVRAM in them.

***Fixed***
I removed the AMI 5101 RAM(& memory cap), socketed it, and installed a NVRAM from another System 80 game I had. High scores and credits are now being saved after power off, and no more strange symbols for initials. All is well in the Gottlieb universe(at least for now).
Thanks guys for the push in the right direction.
Aaron