Mar 122014
 

A quick one here.
Tested a CPU board with known good video gen board and SSIO board connected.
The game had no sync but it appeared the game was running.
Sync could be a bad fault to have as its heavily dependent on the PLD’s found on this board and I have yet to reverse them.
Luckily for me I found the last stage before being outputted to the monitor was to blame. The 7404 chip @ location C4 had stuck outputs, replacing this brought the sync back and the board was fine after that.

 Posted by at 7:47 pm