16kb variant of the IBM 5150

Just about any cheap mono audio cassette recorder? The pinout of the IBM cassette socket was (as Fred said) the same as the TRS-80 Model 1 (and Model 3, Model 4, CoCo, M100, M200, etc). You could use the Radio Shack cable which had a 5 pin DIN plug on one end (to fit the computer) and 3 jack plugs (phone plugs to you?) on the other. One for the remote control, one for singnal from the computer to the tape, the last for the signal from the tape to the computer. The output signal level is eelctable by a jumper link on the IBM 5150 system board to eith either 'Microphone' or 'Aux' level. The input signal is about what you'd expect from an earphone output When the IBM PC came out IBN did not sell a tape recorder or cable. I am told you were supposed to go down to the local Radio Shack and buy said items. -tony