Original IBM SDL to dual ps/2 cable keyboard + mouse, used condition.
Fully compatible and can be fully used with a number of other model M keyboards with SDL ports including 1391401, 1390131, 1390120. Attach ps/2 keyboard end either directly to computer or via ps/2 to USB converter. Leave ps/2 mouse end unconnected.
Originally bundled with some IBM model M4-1, model M5-1, model M5-2 keyboards.