Date   : Mon, 07 Sep 2009 14:35:08 +0100
From   : philb@... (Phil Blundell)
Subject: Acorn World '09: Final Layout & Wiring Plan

On Mon, 2009-09-07 at 13:56 +0100, Rob wrote:
> I think there's a fully working B there, though, but was no use for the BBS as
> I need SWR (or two free slots)

FWIW, if you have at least one free sideways slot then it's fairly
straightforward to fit 32K of SRAM (and probably feasible, though
somewhat more fiddly, to fit 64K).  Of course, if you have enough
machines already then it might not be worth the hassle.

> Oh ... and why would a Model B give me an inverted, black-on-white
> screen?? ISTR that's something to do with the ULA and maybe a link
> somewhere, but couldn't find it on a quick search.

I think that's the symptom of having S26 set wrong for the type of
VIDPROC that's fitted.  Try moving it to the other position and see if
the situation improves.

p.