Restoring a Compaq Portable

Jules Richardson jules.richardson99 at
Sun Jan 18 10:07:38 CST 2015

On 01/14/2015 12:03 AM, David Griffith wrote:
> 3) I can't get the keyboard to respond at all.  I tried touching the
> capacitive pads with bare fingers, anti-static bag material, etc. Nothing
> works.  Solution: I don't know.  I suspect the scan driver and/or the sense
> amp chips may be bad.  These are Exar 22-950-3B (sense driver) and
> 22-908-93A (sense amp).  Does anyone here know a decent source of these
> and/or data sheets?

I know they're more or less a straight IBM PC clone, but is the keyboard 
link portion compatible at the hardware level, such that you could hook up 
a PC XT keyboard just to verify that the system is responding to a keyboard 
at all?



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