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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