Date   : Sat, 25 Jun 2005 00:04:09 +0100 (BST)
From   : Pete Turnbull <pete@...>
Subject: Re: BBC/B+ 64k/128k & Econet

On Jun 24 2005, 18:06, Mike Howard wrote:

> I have a switchable BBC/B+. It has an Acorn card fitted and a switch
to
> select 64k or 128k (I've no idea if this is a standard set-up).

No, it's not.  But I've seen one or two others like that.

> One of
> the leads from the switch is soldered to pin 16 of IC88 (no chip is
> present at IC88).
>
> My question is this; Does anybody know, if fitting Econet to this B+
and
> therefore fitting a 74LS123 to IC88, would cause problems or would it
> just be a case of re-soldering the lead to pin 16 of the 74LS123?

Pin 16 of an LS123 is just the +5V line, so it shouldn't cause any
problems.  Probably just a convenient source of power, controlled by
the switch, for the 64K upgrade board.

-- 
Pete                                           Peter Turnbull
                                               Network Manager
                                               University of York