rjr@mgweed.UUCP (Bob Roehrig) (12/06/84)
A friend of mine just got the MBA-TOR rtty package from AEA. He soon found out that it will NOT work with the Kantronics interface (TU). He is using the Commodore 64. There are a couple of signal lines that are inverted in a couple of the states: rtty data is inverted in the send-space mode, and cw.id is inverted in the send-mark mode. I solved the problem by decoding the leads from the Commodore 64 with a 74LS138 and then re-creating the proper outputs with a 74LS00. If anyone out there has the same problem, I will be glad to furnish the details. The folks at AEA said "just invert one lead" and were not sympathetic. I guess that because the cable furnished will fit, they think that makes it "compatible"!