Yup. I doubt there is any way to convert these but I'd love to be proved wrong. Think these things were EBCDIC, not ASCII. And the connector, possibly like the 3278 one shown below (not 100% sure, but if it has the same number of pins as yours then likely so) is nothing like the AT and PS/2 connectors shown at the bottom. Maybe if you cut all the connections and wired in a new controller but that would be a lot of work and beyond my abilities.
Show Image
(http://www.kbdbabel.org/conn/kbd_connector_ibm3278.png)
Show Image
(http://www.kbdbabel.org/conn/kbd_connector_ps2.png)
That's a completely different interface than the AT. There's absolutely no way you can connect one directly or easily to a PC. Totally incompatible signals. The only way is to custom build a converter box or totally new controller after deciphering the signals which will convert them to compatible USB and/or PS/2 signals. There is no easy way about this. No such thing as hooking it up to a game or parallel port and hoping to patch a driver. Custom electronics (read lots of time and probably money) will be necessary to get anything to work.