Attempt at Compaq keybord swap with a PC keyboard (failed)

[Randy Dawson]

Hi William,

I did use the original kybd to trace out the clock and data, most of the keys work, and I have good scope shots.  I am on it again today, because it sure seems like it should work, using a PC keyboard.


I did not take scope shots on the first test, thinking it should just work.


Hopefully its just a signal inversion, I cant imagine the protocol is that different.  Each keypress looked like a byte of data, 8 cycles on the clock line with corresponding bits on data line.


Randy


________________________________
From: cctalk <cctalk-bounces at classiccmp.org> on behalf of william degnan <billdegnan at gmail.com>
Sent: Monday, January 23, 2017 5:29 AM
To: General Discussion: On-Topic and Off-Topic Posts
Subject: Re: Attempt at Compaq keybord swap with a PC keyboard (failed)

Easier to fix the foam.  But a tip to replace the keyboard...use the Compaq
keyboard bare by pressing fingers directly on the board, verify that works
that way (it should).  Record the signals' wire path, match the replacement
keyboard wiring.
B

On Jan 23, 2017 12:45 AM, "Randy Dawson" <rdawson16 at hotmail.com> wrote:
>
> This is the original Compaq I IBM PC clone, 8088
>
>
> ________________________________
> From: cctalk <cctalk-bounces at classiccmp.org> on behalf of Fred Cisin <
cisin at xenosoft.com>
> Sent: Sunday, January 22, 2017 9:42 PM
> To: General Discussion: On-Topic and Off-Topic Posts
> Subject: Re: Attempt at Compaq keybord swap with a PC keyboard (failed)
>
> On Mon, 23 Jan 2017, Randy Dawson wrote:
> > I have luggable with the famous Keytronics foam kepad rot.
>
> WHAT model Compaq?
>
> 8088? 80286?
>