Restoring a HP9830B calculator.

[Tony Duell]

The Cherry switches were a standard part, in that I found an non-HP keyboard that used them. I have a few (very few) spares somewhere, hopefully they will turn up sometime...

As regards getting the machine going, in my experience power supply problems are uncommon, and I've yet to replace a capacitor in the PSU of any HP9800 machine. But logic problems are common. Most of the time the display is totally blank and the fault is somewhere in the CPU/memory control section. A logic analyser is very useful.

Good luck with the HP9880 disk system. This is going to be one of my next projects, I have all the bits of one now...

Let me know if I can be of any help.