[time-nuts] HP5065A digital clock info

paul swed paulswedb at gmail.com
Tue Sep 27 18:30:30 UTC 2011

Ed I may be wrong. Its not on Diddiers site. I thought I obtained my print
from the web.
But I also do not seem to have the pdf. Quite curious. Will keep digging

On Tue, Sep 27, 2011 at 2:25 PM, paul swed <paulswedb at gmail.com> wrote:

> Ed the 5065a manual does have the schematics. Its available online free. I
> think Diddiers site has it. There seemed to be at least 2 chips that were
> used.
> Bottom line is the data on how hp used and drove is available which is
> great news
> Paul
> On Tue, Sep 27, 2011 at 1:54 PM, ed breya <eb at telight.com> wrote:
>> I am restarting an old project to transplant my HP Z3801A guts into a
>> 5065A carcass, and now designing the power system. I'd like to keep the
>> original LED clock function, but with all new power and interface. I traced
>> out the circuit partially a few years ago, and am going by the notes I made
>> back then.
>> The clock IC is a 28 pin DIP, marked with the National Semiconductor logo,
>> and only the code "025B." I assume it is a standard clock IC of the era,
>> probably PMOS. Does anyone know the true part number? I have never seen a
>> 5065A schematic or parts list. The HP part number may help if it can be
>> cross-referenced. I have looked at data on a number of National and other
>> clock ICs from back then, and saw none that seem to match what's in there.
>> Ed
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