HP262x keyboard voltage

[Rik Bos]

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
> 
>