Den Wed, 5 Sep 2018 09:47:16 -0500 skrev Jim Brain <brain@jbrain.com>: > The direction of the RxC pin is set via bit 4 of the control > register. if 0, RxC is an input, and is used to drive the receiver > logic. If 1, it is an output and will represent the output of the > divisor above (16* the receiver bps rate) > > The idea was to allow split bps rates (600bps send, 300bps receive). > No one actually used it, but it is supported. There might also had been an idea to use it with for example a Kansas City compatible tape interface. The various schematics of Kansas City compatible interfaces I've seen does of course just modulate the transmit data signal, but from the audio signal it generates both the receive data signal and also the receive clock. This way it works even when the tape speed varies quite a bit, as you would expect from cheap portable mono audio cassette recorders. It's a rather inefficient standard as it stores a start bit and a stop bit for each byte and afaik it was also usually used to store data as ascii and not binary. In comparison the PET tape interface performed rather well. -- (\_/) Copy the bunny to your mails to help (O.o) him achieve world domination. (> <) Come join the dark side. /_|_\ We have cookies.Received on 2018-09-05 20:00:05
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