And using a 2392A keyboard ?
It also uses the HP150 keyboard interface..
The original keyboard looks a lot like the small HP 9816 keyboard..
Maybe you could modify one of those.
-Rik
-----Oorspronkelijk bericht-----
Van: cctalk-bounces at
classiccmp.org
[mailto:cctalk-bounces at
classiccmp.org] Namens Tony Duell
Verzonden: vrijdag 3 april 2009 20:02
Aan: cctalk at
classiccmp.org
Onderwerp: Re: HP262x keyboard voltage
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