Checksum Errors on my Simpson Party Pinball.
I recently started getting a CheckSum $F0FF errors when I power on my TSPP.
I thought it was a bad CPU ROM so I bought a new one from Marcos and installed it, same error message.
I thought it might be the Display ROM so I swapped out the CPU ROM v5 and Display ROM v5 with my 4.0 versions and I get a CheckSum $4FF (CPU 4.0 ROM) So I am pretty sure it is not the CPU ROM or Display ROM. Thoughts?
Looking for ideas where to start.
Thanks in advance, be Well!