Date   : Fri, 12 Jan 2007 19:51:13 +0000
From   : adsb@... (Andrew Benham)
Subject: ADFS and DFS in a beeb

Andrew Benham wrote:

>> The other obvious question is whether Watford's DFS is compatible with the 
>> 1770 chip? (or the 1772)
> 
> Only if you've got the 1770 version of Watford's DFS...
> 
> Watford also did a DDFS, which is only for a 1770 and supports double density
> (18 sectors of 256 bytes) for DFS.  I must have a copy somewhere, because I
> hacked it to work on the BBC Master.

I remembered on the way home tonight that Watford did a 1770 disk
upgrade which wasn't compatible with the Acorn one (presumably
because it pre-dated Acorn's).  I had one here ages ago, but never
used it.

Does your 1772 adaptor board have any markings on it ?  I've come
across Acorn, Solidisk, and Watford 1770 disk upgrades - and there
may be more.

-- 
Andrew Benham         adsb@...       
Southgate, London N14, United Kingdom

The gates in my computer are AND OR and NOT, not "Bill"