20
Mar
18

Trying the Campbell Cassette Interface

Some time ago I acquired an interesting bit of vintage tech, the Campbell Scientific C20 cassette interface. Since then it had been sitting on my bench looking lonely, I decided that I should at least try it out before I salvage any of the many useful chips it has inside. I have found a user manual for it along with information confirming that it is indeed what I thought it was, an interface for reading data encoded on audio cassettes by data loggers.

Not having any audio cassettes with appropriately encoded data however created a very simple issue. How exactly should I get it to do anything at all? It turns out whilst the C20 is primarily designed for reading from tape, it is possible to get it to write one as well, I thought we might as well look at the encoding on my oscilloscope and record a sample of the audio.

So I connected my oscilloscope to the output and a serial line to my old MS-DOS machine. After twiddling with the serial settings both on the machine and in Kermit I managed to get a welcome message and menu from the device which confirms that at least the CPU and serial lines are working. Unfortunately this is about as far as I have gotten.

The manual is exceptionally useful, providing not only information about basic use, but also more detailed technical information and example programs in basic for operating the device. I’ve translated one of these programs for writing data to tape, it seems the device is receiving the data I’m sending, but nothing appears on the output that I can see. I’ve not worked out if it’s something as simple as not connecting the scope correctly or if there is some hardware failure.

So unfortunately not as much to report as I’d like, but time has been quite limited and something is better than nothing. I’ll keep trying in the short term.

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