When I try to set the High Score value to grant a free game it goes up in steps of 10,000 like it should but it starts at 7100 and goes up in steps of 10,000 from that, so I can't set my score to give a free game to 240,000 like my game cards I have to set it at 237,100 or 247,100 which does not seem right.
Also the match will sometimes give 91 instead of 90, or some other number with a 1 at the end, but not always. I know my match display works correctly so its not an issue with the display.

Firstly has anyone come across this high score issue, I'm wondering if it is some corruption with my RAM chip indicating my RAM might have faulty bits in it.
Like wise with the match 91 issue.

What are everyone elses thoughts on this?

High Score (resized).jpg

match 91 (resized).jpg

Gold star to you, I completely missed the starred statement in the manual that says can be quickly set to '00' by pressing S33 on the MPU assembly.
I will go try that now.

Thank you, that's all it needed.
My MPU has the supercap mod and was turned off for about 2 months whilst I rebuilt it and obviously discharged and when I turned it back on the RAM was just full of garbage.
Kicking myself for missing that in the manual, I've only had the machine running for a bit over a week and this is my first solid state machine so still working it all out.

Will see what happens with the match number now.