I just had a wild one and thought I'd pass this on to everybody. Might save someone some grief.
_Asteroids Deluxe_ motherboard. Plays great and passes self-test right off the bat, no problem.
However: After playing the game for a few minutes, when you try to enter self-test, the board crashes. I get a series of tones. Turn game off for a few minutes, and everything returns to normal. Sometimes you can enter self-test from a cold start, sometimes you cannot. When you can enter it, everything passes.
Turned out that I had one or more heat-sensitive 2114 RAM chips in the vector circuitry!!!!! I installed sockets beneath all the RAMs and substituting new RAMs eliminated the problem totally... even passing the "heat & beat" test. Now I can enter self-test at any time with no trouble at all. Whew!
Matt J. McCullar
Arlington, TX
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Received on Thu Aug 22 21:22:46 2002
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