3471 terminal

The protocol used by 122-key 3270 keyboards is pretty much the same as the AT / PS/2 one. In fact, it's more the other way round; the original 84-key AT keyboard is a cut-down version of the 6110344 122-key terminal keyboard. They use the same microcontroller and scancodes. The differences in the protocol are minor. If you just plug a terminal keyboard into a PS/2 keyboard port, it may work in DOS, it will work in Linux (using the 'atkbd.terminal=1' boot parameter) but won't work in Windows without a patch to the keyboard driver. It's also possible to make 6110344-type keyboards (if they're model F, not model M) completely compatible with the PC by substituting the microcontroller ROM from an 84-key AT keyboard. Or by burning a custom 8748: <http://www.seasip.info/VintagePC/ibm_6110344_cswap.html> There is also at least one converter, which will work with any variant of the terminal keyboard: <http://deskthority.net/workshop-f7/xt-at-ps2-terminal-to-usb-converter-with-nkro-t2510.html>