Date   : Wed, 19 Jul 2006 23:57:09 +0100
From   : Rob <robert@...>
Subject: Re: Vine Micros Replay

At 14:52 19/07/2006, Peter Van Ek wrote:


>
>While on the subject, does anyone have the circuit diagram for the 
>BBC Master replay system ?
>

No. but I've got one, and might be persuaded to try and work it out!

It's a little more complicated, 74LS138, 74LS32, 74LS14, 74LS38, 
74LS30 (all B1 suffix?) some caps and resistors, three ROM sockets 
(it sits in the 1Mb/MOS ROM socket with the MOS ROM relocated to the 
board) and the Replay ROM doesn't appear as a separate entity in 
*ROMS.  There's a spare socket. A flying lead to a piggy back 
arrangement on IC51? with connections to pins 14 & 37, and another to 
the button.  There is a 2 pin jumper header too.

You can see it in the pics at http://www.irrelevant.com/bbc/tower.html

Rob.