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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