The Museum of HP Calculators

HP Forum Archive 13

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HP85 bus signal levels
Message #1 Posted by Vassilis Prevelakis on 31 May 2003, 2:12 a.m.

I assumed that the HP-85 (and other Series 80 machines) have 0 to +6V levels, but looking at the service manual on the MoHPC CDROM, I see that the clock signals are 0 to +12V.

Can someone post here the levels that are expected on the various pins of the I/O bus?



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