Date   : Mon, 05 Feb 2007 14:06:59 -0000
From   : BBCMailingList@... (Ian Wolstenholme)
Subject: PL1 on Acorn Teletext Adaptor Board

I've just had a further thought, I don't think Acorn would have
been supporting/developing for the System and Atom as late
as 1984 but the Acorn Reuters Board has similar 64-way
connectors so maybe there was an option to put a teletext
adapter in the Reuters machine.

I think these were used in stock market trading rooms and
newspaper head offices so perhaps the teletext board was
used for supplying information such as news headlines and
share prices.

Best wishes,



Ian

----- Original Message -----
From: Ian Wolstenholme [mailto:BBCMailingList@...]
To: bbc-micro@...
Sent: Mon, 5 Feb 2007 13:54:23 -0000
Subject: Re: [BBC-Micro] PL1 on Acorn Teletext Adaptor Board

Any excuse to take something to bits...

This PL1 connector on the Teletext Adapter board is a 64-way
connector.  The only time I recall having heard of Acorn using
64-way connectors was for the Acorn System rack and the
Atom expansion port.

Looking at the board, it's as if it is an alternative, PL2 is the
standard 1 MHz Bus connector and PL1 would possibly be
for something else.  Maybe Acorn planned to use the
Teletext decoder with the System or Atom, although the
board is much too wide to fit into a System rack.

I can't find the Teletext Adapter Service Manual online which
might give us a clue.

Best wishes,



Ian

----- Original Message -----
From: Joel Rowbottom [mailto:joel@...]
To: bbc-micro@...
Sent: Sat, 03 Feb 2007 13:16:50 +0000
Subject: Re: [BBC-Micro] PL1 on Acorn Teletext Adaptor Board

--On 03 February 2007 13:11 +0000 David Hunt <dm.hunt@...> wrote:

>> Anyone know what this was for please?
>
> Just a guess, looking at mine, that it could take a connector as a
> pass-through to allow a chain of devices. I've not seen a second socket or
> cable fitted to one, as such it has always had to sit on the end of the
> bus in my systems. I guess you'd have to disable the termination
> resistors if it wasn't the last device in the chain...

I wondered about that, but it's substantially longer than a 1MHz bus 
connector, or even a TUBE port.


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