Date   : Tue, 30 Mar 2004 19:01:02 +0100
From   : Sprow <info@...>
Subject: Re: Watford > Acorn DFS

Hi,

> Would I be right in saying that I could fit a Watford DFS ROM to my 
> master, having *unplugged the other DFS/ADFS present
> and thereby read my old 51/4 double density Watford disks?
>
> I have a Master 128 at present with a 31/2 drive and would like to 
> transfer my old beeb b (watford) 5 1/4 disks to 3 1/2 " on the Master 
> (Acorn DFS).

I'd be almost 100% certain that this wont work as the Watford DFS will
expect to find an 8271 disc controller (like the BBC micro has).
You might have better luck looking for one of those DFS clones which claim
to be able to read the Watford discs, and which also work with a 1770.

The added confusion will come in that the Master 1770 interface is in a
different place in the memory map and the control register is layed out
differently too: so even that might not work.

When writing DOSFS I decided to attempt to detect which machine I was
running on, choose the base address and register layout based on that, then
select the appropriate NMI handler based on that,
Sprow.