Not positive what it is but it has something to do with video, it does have video switching. From Video, From Computer and To Monitor BNC video connectors, also has BBC 1MHz bus connection and a Disc Drive connection to the internal 3.5" floppy disc drive along with power from the BBC.
There are 2 6522 IC's on the PCB along with 5relays, some other logic IC's (TTL and CMOS).
The gap underneath fits a BBC B or B+ but is too small for a Master.
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If anybody would like to add any information to this unusual item please let me know and I will put all the information together. I would like to know if anybody has seen or used one, and if anybody has any literature or software for it. I am still looking through my discs to see if I have anything for it.
If you would like to use any of these images on your own website please let me know.
Chris Richardson, I am sure you would like to put them on your 8BS site and you are welcome to use them and resize them as you wish.
Matt Cocker