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.