LK201:
 > I found a few of the keys didn't work right on
 > one of them. This is one of those conductive rubber
 > dome keyboards (and cheap and junky ones at that). 
All the LK201s I've worked on have used membrane switches. But I believe
there are several versions. 
 
Actually not less than 4 different versions as LK201 and then you
had the 301, 401 and later versions based on it.
 Since the LK201 protocol is fairly easily available, I
would have 
thought
 it would be possible to use a single-chip
microcontroller to link a PC
keyboard to a LK201 port. I've never tried to write the code, though. 
This is doable.  Though most of the LK201s had 8051 chips and you
could program a 8751 and put that in if you like.
Allison