HP262x keyboard voltage

[Tony Duell]

> 
> I'll look around for you and will place a small posting on our Dutch
> collectorslist (cvml).

Thank you.

> May be something comes up (not a great chance).

I think it's unlikely. The HP120/HP125 machines don't seem to be that 
common (and after looking at the internals, I can see why, I don't think 
it's a particulalry good design!). 

Anyhow, I think I've worked out how to interface the HP2523 keyboard and 
modify the HP150 one. All (!) I need to do is find the bits and solder it 
all up.

-tony