Bizarre Intermittent Pac-Man Issues

BrywalkerX

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Ok so I have been searching and searching for the past two days and cannot find anything on the issues I am having.

Board is installed. Powers up fine. No graphic issues. In attract after cold boot, once Pac is supposed to show up on the screen it reboots. Then - perfectly fine looping attract for hours and hours.

When playing, sometimes you can get Pac stuck in the maze. If you are going to take a corner early it will show him change direction before the corner and you are just stuck. You can resume movement by pressing a valid direction.

Sometimes you can clear the maze but it will not advance. You just have you and ghosts and you have to die to end the game. Maze repopulates with all dots missing - game is all done from there.

Then other times when you are playing, when you advance to the next maze there are some dots missing. Like totally missing - if you go over them, no sound, no points.

This is totally baffling. Of course I don't have a logic probe, self test shows memory Ok. Reseated ROMS, swapped z80, VRAM, I have a TTL SBC (which works fine in my Ms. board.

Any thoughts at all?
 

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