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HP-67 - 1612A03018 - Card Reader Advice Requested (was HP-67 - strange behavior)
10-20-2019, 03:19 AM
Post: #18
teenix Offline
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RE: HP-67 - strange behavior - any advice appreciated
(10-19-2019 11:24 PM)albertofenini Wrote:  On the board side : we took some measurements on the broken CPU board.
This is the one that has a suspected ROM0 not working.
We have found good Phi1 and Phi2 on the ACT, the CRC and the ROM0.
However, the side of the ROM0 that handles the segments of the display is dead.

Can you see LED data with the CPU board out? Maybe the anode driver is loading it incorrectly.

cheers

Tony
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RE: HP-67 - strange behavior - any advice appreciated - teenix - 10-20-2019 03:19 AM



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