Asteroids VSM debugging

DanP

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Hi all, does anyone have any tips or guides on how to repair the VSM on Asteroids? I've battled with this board for a few weeks and it was briefly working. Now it's got a problem in the VSM (it will play blind with the DMAGO diabled). I've verified that the vector RAM is OK with a catbox and a Fluke 9010. Is there a best place to start? Guddler you mentioned on IRC that you just test all the VSM 14/16 pin ICs with a logic comparator and then shotgun the 20pin ones. Do you have a list of the ICs you check and any pointers on the usual suspects?

Any help much appreciated.

DanP
 
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