Unusual software carriers. (Was :Vinyl Data- Classic Computers )

[Tony Duell]

> BBC Microcomputer, not surprisingly, for which there were at least two 
> teletext adapters (the original Acorn one and later one from a third 
> party company called Morley Electronics).  The teletext adapters connect 
> to a BBC Micro via its 1MHZ expansion bus.  Most of the BBC telesoftware 

Minor correction. The Acorn teletext adapter, which used the SAA5020 etc 
chipset did, indeed connect via the 1MHz bus. But the (IMHO) nicer Morley 
one connected to the User Port. It had an I2C interface to an SAA5240 
chip (this teletext decoder used the I2C bus mot only to select the page, 
etc, but also allowed you to read/write the teletext page memory, so 
transfering the page to the BBC micro was relatively easy). There was 
also a CITAC (Computer Interface for Tuning and Control) chip on that I2C 
bus (I forget which one was used), this was used to select the TV 
channel, IIRC the Acorn one had 4 preset pots to select the channel, the 
computer could then select one of 4 channels.

-tony