18 Jan
2015
18 Jan
'15
4:07 p.m.
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?
cheers
Jules