(MS-DOS machines) since about 1983 and I have yet to
see one. Another
thing I've been looking for without success is an IBM Cassette recorder
for the IBM PC cassette interface. I've heard they really do exist.
Now that's something I've never seen.
One interesting point is that the pinout of the cassette socket on the PC
(although not on the PC-jr) is the same as that on a Tandy Model 1/3/4/Coco/etc
It is rumoured that IBM intended you to go down to the local Radio Shack and
buy one of their recorders + cable.
-tony