don1400
Member
Up until about 10 days ago I had a working Pacman, but after I took the board out so I could test a 4 in 1 mod I did on a friends board Murphy's law kicked in. Just swapped boards to test my wiring of the 4 in 1, played a few rounds and reinstalled my board only to find it not working. I've checked Mowerman's site, Mike's Arcade and I did see something similiar to my boards symptoms on Arcadegame over pix concerning video RAM, also checked out Trouble Shooting Logic board repair manual. Here's the limited things I've done to try to find problem, checked ROM checksums, swapped all video RAMS with known good ones, good Z80, sockets on the Z80, sync buss controller & V RAM cards replaced several years ago.
You can take a look at what game is doing and take a listen to the audio (constant pulsing sound) here: http://www.youtube.com/watch?v=gibRPvwiZ70
Note: vid runs about 25 sec, the entire sequence ends with the screen showing zeros and green dots plus no audio pulses, at this point the game will stay on that screen till it is unplugged and powered up again.
Any Pac experts have any thoughts on this problem?
Thanks,
Rich
You can take a look at what game is doing and take a listen to the audio (constant pulsing sound) here: http://www.youtube.com/watch?v=gibRPvwiZ70
Note: vid runs about 25 sec, the entire sequence ends with the screen showing zeros and green dots plus no audio pulses, at this point the game will stay on that screen till it is unplugged and powered up again.
Any Pac experts have any thoughts on this problem?
Thanks,
Rich
