Dig Dug freeze problem

I have two Dig Dug PCBs which are exhibiting the same
problem. In two different Dig Dug cabinets. Weird.

The game will boot up just to the beginning of attract
mode, and then freeze. There will be 9 Dig Dug characters
at the bottom of the screen and the game will not advance,
nor will it coin up.

In self test, everything checks out ok.

Here's a picture of the screen:
http://www.ionpool.net/dig_dug.jpg

I did a quick swap of the three Z80s and it had no effect.
I have also checked to make sure the 'Freeze' dip switch
is not turned on. Suggestions?

tom
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Received on Sun Dec 28 13:43:49 2003