My new(ish) HP-45

[teenix]

(01-14-2020 03:38 PM)jwhsu Wrote:  I’m not sure you can get the required crystal without cannibalizing a broken HP55. There was a thread on this board about using a resonator/oscillator as a substitute with reasonable accuracy:

HP 45 oscillator

I did obtain one after contacting the OP several years ago. I don’t know if there are any left or if he is providing modules.

I saw that, thankyou.

I wonder how the anode driver deals with a square wave clock signal when it is set up to accept an R/C or crystal input. I know modern microcontrollers can accept all manner of clock drivers but the inputs are user configurable.

cheers

Tony