Can't go PS/2, have problems with the port. Modern keyboards that just happen to have the plug do work but neither an M nor an old-but-no-so-old IBM rubber dome (SK-8820) did. I was thinking about having a pad or possibly two separate pads, one for punctuation marks that didn't make it to the standard keyboard layout and the other for fancy French and German letters that show up in surnames and place names when translating European documents. In fact, I could probably come up with whole words to bind on programmable keys, lol.