On Thu, 22 Sep 2005 08:13:46 -0600, you wrote:
>> I checked the voltages and the -28V measures -27.95V at the test point
>> and at the leg of the chip. It seems steady with a DMM. Do you think
>> the caps could still be problematic? Btw 5V is running at 5.05V.
>Hmmm, well then. Im guessing the only other problems might be related to
>the EAROM being bad (I think they do have a limited lifespan).
Check the 74LS174 and 74LS175 data latches at P2 and K2, respectively,
before you give up hope on the ER2055 chip. :) I once dealt with a
CENTIPEDE game that wasn't saving its high scores, and it turned out that
one of the outputs on the LS175 latch was stuck; thus, the high scores
weren't being saved because the ER2055 wasn't actually being told to go
into "write" mode.
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A: Because it reverses the natural flow of conversation.
Q: Why is top-posting bad?
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solarfox@DON'TMESSWITHtexas.net (Gary Akins jr.)
http://lonestar.texas.net/~solarfox
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Received on Thu Sep 22 16:32:17 2005
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