HP97 The journey begins
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10-19-2021, 10:13 PM
(This post was last modified: 10-19-2021 10:14 PM by teenix.)
Post: #460
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RE: HP97 The journey begins
Its a shame if the ROM 0 chip has failed but you might be able to get a spare if you ask around.
The normal signals coming out of ROM 0 are not straight logic levels. They have a common external resistor switched in series with all the anode driver base lines, 220R located just to the left of ROM 0. cheers Tony |
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