Date   : Wed, 22 Jun 2005 22:13:55 +0100
From   : Sprow <info@...>
Subject: Re: Watford Electronics DFS

In article <6tttPoDnLbuCFwWP@...>,
   Mike Tomlinson <mike@...> wrote:
> In article <050622145502@...>, Jonathan Graham Harston
> <jgh@...> writes

> >No, there is Watford DFS for the 8271 and Watford DFS for the
> >1770.

> You'll find the Watford 1770 DFSes are actually called DDFS.

> >Looking through the Watford DFS ROM images I have, I can confirm:
> > 
> >1.10  - 8271
> >1.30  - 8271
> >1.43  - 8271
> >1.44  - 8271

> Agreed.

> >1.54T - 1770 - Tube Host

> 1.54T actually declares itself as DDFS 1.54T, if you'd care to try it.
> The extra D is "D"ouble density, which the 1770 is capable of.

Now I'm confused. I'm sure I had a Solidisk DDFS at some point where the "D"
was for dual.

The interface board then had both an 8271 and a 1770, and a toggle switch at
the back of the case to select one or the other. This way games which
expected an 8271 could see an 8271 and the 1770 could operate the rest of
the time.

Sprow.