Clock: PD1
And VCC and GND, of course. See RESOURCE for keyboard connector pin assign.
+Use 1K ohm pull-up resisters on the signal lines.
BUILD
RJ45 Connector: http://www.kbdbabel.org/conn/kbd_connector_ibmterm.png
DIN Connector: http://www.kbdbabel.org/conn/kbd_connector_ibm3179_318x_319x.png
+
Terminal keyboards
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122-key