This came with my 16K BBC Model B. Unlike most of the "cheese wedge" accessories, this connects to the RS423 port and not the 1 MHz bus.
I have never been able to get this thing working properly. When you try to dial out, the pulses the adapter produces are very faint and too quiet to be picked up by the telephone exchange.
This was the only thing I had which comes in the famous Acorn "cheese wedge" box until my Acorn Teletext Adapter arrived!
E-mail me if you can help me to fix it!
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