Date   : Thu, 06 Dec 2001 11:51:45 +0000 (GMT)
From   : Sprow <rsprowso@...>
Subject: Re: Help!!

On Wed, 5 Dec 2001, Graham Bisset wrote:

> At 08:59 PM 12/3/01 GMT, you wrote:
> >On Dec 3, 11:21, George Reynolds wrote:
> >
> >> >You probably also need to replace the links on S21; there should be two
> >> >links running east/west.
> >>
> >> Sorry. Could you elaborate on this please. I am unsure what you mean!
> >
> >OK.  If it's a BBC B (not a B+ or Master 128) there are several sets of
> >selection links in the form of Molex jumpers on square pins.  
> 
> I've just removed a sideways rom board from an old BBC and it uses this S21
> link.  Can this be used in a Master 128 anyhow?

There isn't really a direct equivalent to 'link S21' in a Master,though I
guess with circuit diagram in one hand and a bit of 7400 series logic in
the other you could get the signals.

However,you'd not be able to use any SRAM that's on the card,as writes to
&8000 go into VDU workspace or the built in sideways RAM (depending on
the values in ACCCON and such like).

ATPL did make a Master version of their ROM board,but I've never seen one,
Sprow.