I have an old keyboard (circa 1998) with a male DB9, and I'd like to use it on a modern PC with a female PS/2. The keyboard is AT&T branded, Comcode #405748401, FCC ID CIG8AVE03417 Keytronic corporation. I suspect, but I'm not certain, that the DB9 pinout is the same as an AT&T 6300: http://pinouts.ru/Inputs/KeyboardAtt6300_pinout.shtml. From that site I also found wiring pinouts for 5-pin DIN keyboard sockets and female PS/2 sockets, both of which seem compatible except the keyboard pinout shows +12VDC while the standard keyboard sockets show +5VDC.
Can anyone confirm the pinout for my keyboard? If it does match the 6300, can I just wire a DB9 to PS2 adapter and expect it to work? Am I likely to fry my motherboard if I get this wrong? This keyboard came from an old AT&T PC, and it's possible that the keyboard connector was proprietary or a serial port. I'd hate to damage either the keyboard or my new computer with a bad guess.
Best Answer
I'd strongly recommend sending Keytronic an email on this one. They're one of the few who will know for sure without disassembling and reverse engineering what you already have. They'd probably be thrilled to hear from such a fan of their work!
I went through something similar with a heavy IBM tactile keyboard from 1984. The cable unplugged on both ends and was lost in a move, so I was looking for the pinout of their slightly squashed RJ19 looking connector. It was manufactured by Lexmark, and they helped sort me out via email after routing me to their 'old man on the mountain' keyboard guy. Sadly, it died it's final death about a year later from a close encounter with a four year old. I still hit the thrift stores once in a while looking for another to pop up, but I've pretty much adjusted to my $9-on-sale keyboard now.