I got a game a while back with a pretty badly acid damaged Bally AS-2518-35 MPU board. The main ground trace surrounding the board on both sides was nearly gone.
After cleaning it up and sticking in a battery corrosion repair kit, pin headers, and recapping the solenoid board with parts from Great Plains Eletronics, I was able to get the the game booting up and playing normally. However, I'm having an issue with the displays that I haven't seen anyone else mention before.
While the displays seem to be showing the correct info (score, credits, etc.) they seem to be 'strobing' very slowly.
From what I've read, the MPU displays one digit at a time on the displays, but does it at a rate of about 350 times a second which in effect makes the display appear that all numbers are being shown at once.
Mine seems to be going at a much slower rate as the video shows.
http://www.youtube.com/watch?v=y22D6Vfp3xw
Any ideas?
After cleaning it up and sticking in a battery corrosion repair kit, pin headers, and recapping the solenoid board with parts from Great Plains Eletronics, I was able to get the the game booting up and playing normally. However, I'm having an issue with the displays that I haven't seen anyone else mention before.
While the displays seem to be showing the correct info (score, credits, etc.) they seem to be 'strobing' very slowly.
From what I've read, the MPU displays one digit at a time on the displays, but does it at a rate of about 350 times a second which in effect makes the display appear that all numbers are being shown at once.
Mine seems to be going at a much slower rate as the video shows.
http://www.youtube.com/watch?v=y22D6Vfp3xw
Any ideas?