Date   : Fri, 06 Aug 2010 20:29:16 +0100
From   : jumbos.bazzar@... (Mark Haysman)
Subject: schematic wanted

> Hi all,
>
> I'm looking for a schematic of the 1770 upgrade for the BBC B. Can someone
> direct me to the correct URL?

I did a trace of the Acorn module, before modifying it to use a PAL and one 
logic chip rather than 3. I've put the schem up here:

http://www.retroclinic.com/misc/1770DFS_logic.pdf

Feel free to put it on a reference site if required.

Mark.