Date   : Wed, 04 Jul 2007 17:21:33 +0100 (BST)
From   : debounce@... (Greg Cook)
Subject: Anyone recognise this board?

On Wed, 04 Jul 2007 07:29:50 -0500, Jules Richardson
<julesrichardsonuk@...> wrote:

>  > I was wondering whether it was a header board
> > for one of those external ROM/RAM boxes that let you switch in
> > one of eight ROMs or sideways RAM banks. There were three or
> > four marketed in the eighties but I've never owned one so I'm
> > not sure what the interface would have looked like.
> 
> You beat me to it :-) That was my guess, too - the only such box I've
> got here 
> though is a GCC RAMROM-15 and that uses a 40-way cable (plus the beeb
> 
> interface plugs into the 6502 socket I seem to remember, not a ROM
> socket as 
> yours appears to).
> 
> I'm not sure why the cable would show signs of two external
> connectors though 
> (unless it was possible to drive more than one external unit - but 34
> lines 
> doesn't have much scope for control and addressing).
> 
> Given the length of the cable, it seems unlikely that it was just
> some form of 
> ashtray-based ROM cartridge or whatnot.

Found it!  Skimmed through a couple of Watford Electronics 'catalogues'
for it on a hunch...  and there it was in a completely different
advert.

In The Micro User, November 1984, p.218 is an HCR Electronics external
RAM/ROM card.  The 'header' board connects to a ~30cm square metal
case, with a power supply and one or two boards with ROM sockets in
both.  It claims to support 16 ROM slots overall, or 28 with the
optional second board.

The BASIC ROM socket was empty as sold, presumably someone has
unplugged their ROM and put it in this board.

Greg Cook
debounce@...
http://homepages.tesco.net/~rainstorm/


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