HP262x keyboard voltage

[Tony Duell]

> 
> Does a HP125 do the trick ?

It should do -- it's the same keyboard I think.

> If so I'll make a measurement for you.

Sombody else has already done that HP125 and got 5V (or thereabouts). 
This suprises me, the keyboard cotnains 3 chips, all from the 4000 CMOS 
family (IIRC, a couple of 4028s and a 4051), along with some discretes. 
Why use CMOS chips if you're going to run them at 5V?

Perhaps I should explain what I am trying to do. I have an HP120 without 
a keyboard. So of course I need to hack something up. The keyboard 
interface on the HP120 is the 6 pin RJ11 one at 12V, it's electrically 
the same as the HP150 keyboard intereface, but the keys are in a 
different electrical arrangement. My 2 thoughts at the moment are either 
to mofify a 'spare' HP150 keyboard or to make an interface to an HP262x 
keyboard (I have an HP2623 which I cna 'borrow' the keyboard from). 

-tony