Date   : Sat, 25 Jun 2005 09:59:41 +0100 (BST)
From   : Greg Cook <debounce@...>
Subject: Re: Watford Electronics DFS

On 24 Jun 2005 10:22:22 +0100, Jonathan Graham Harston wrote:

> If I come across the information I'll let you know. Otherwise, if
> anybody had Watford DFS 1.5x earlier than 1.54 I could disassemble
> it and work it out.

Probably it reuses the 8271 address space, which is the simplest
solution.  A list of known address assignments can be seen at:

http://www.nvg.org/bbc/doc/wd1770.txt

The Opus option is the most likely candidate.  The control latch
structure is probably different from Acorn's as well, see the above
link.

Greg



               
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