== Technical ==
(information from the documentation with the "Prestel Link" software.)
Prestel link hardware:
* 4Mhz clock from expansion bus is clock for 8251
* Chipset: uses [[8251 USART chip|8251 UART]] (according to the advert)* I/O ports are: FADF read/write data FBDF read status/write control
* Note - Cirkit reportedly also made a "Twin-port" serial interface (which probably used other chipset)