Date   : Tue, 20 Feb 2007 22:50:12 +0000
From   : beeb@... (Kris Adcock)
Subject: Some Beeb addons

Evening all!

I've acquired a dusty model B with one or two expansions I'm not very 
familiar with.

There's a Computer Village LVL DOS board, labelled "CVX7 Disc 
Interface". The controller on it is an FDC 1797, and there's a ROM 
marked "LVL DOS 1.00". How does this compare with the more usual 8271 or 
1770 interfaces?

There's a Watford Electronics 32K RAM card, with an accompanying ROM. 
The board holds the 6502 processor - there's a short ribbon cable to 
connect it where the 6502 would normally go. Does this RAM card add 
another 32K (making it a 64K machine) or is the extra 32K used as 
Sideways RAM?

There's a Computer Village sideways ROM board, with sockets for 16 ROMs 
- that can't be right, can it? There is also a row of 15 jumpers, each 
of which can be set north or south. Anyone know what they are for? Also, 
the 6502 processor and ULA are held on this board - the boards connect 
to where they should be on the main board. Is this just to make the 
board secure, or is the board doing something special that requires 
these ICs moving?

Does anyone have scans of the docs for these items? The Beeb isn't 
really working properly (it never gets to a prompt - just makes a 
constant beep tone) and I'd like to remove them to clean the machine and 
help narrow down where the fault is - but I'm not sure about what 
jumpers I'd need to change on the board when I remove the ROM board.

If you're still reading this far - thanks for your patience! :)

Cheers,

Kris.