Date   : Fri, 04 Feb 2005 02:18:02 +0100
From   : John Kortink <kortink@...>
Subject: Re: Watford DDFS

On 04 Feb 2005 00:42:12 +0000, Jonathan Graham Harston wrote:

>"John" <blip@...> wrote:
>> I understand that if I buy a BBC with 1770 DFS/ADFS, I can swap
>> out the ROM and replace this with a Watford DDFS and everything
>> will work as expected. Is this true - and would someone on the
>> list blow the ROM for me? I had a contact in Holland, but I lost
>> his emails in a recent PC problem.
> 
>Yes, with later versions of Watford DDFS. Earlier versions of
>Watford's DDFS interface and the DDFS that went with it put the
>Floppy Disk Controller in a different part of the memory map to
>Acorn's 1770 upgrade.

Actually, it's in the same place. But one or two bits
of the drive controls are in different places than for
the Acorn interface.

>Later versions used the same addressing as
>Acorn. Watford DDFS 1.54 will use the Acorn 1770 upgrade.

Not exactly. 1.54T will. 1.54 proper is still for the 'older'
(Acorn-incompatible) Watford interface.


John Kortink

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