Date   : Tue, 07 Jun 2005 23:56:08 +0100
From   : jgh@... (Jonathan Graham Harston)
Subject: Re: GoMMC versus hard drive. Which way to go?

John Kortink <kortink@...> wrote:
> Oh, and the IDE solution is Master only at the moment
> (correct me if I'm wrong). GoMMC works on BBC B, B+,
 
The IDE interface, both the 8-bit and the 16-bit versions, work on
both the Master and the B, as well as the B+, the Compact (with an
appropriate edge connector), the Electron (with a 1MHz expansion)
and even a RISC OS machine with a BBC I/O podule[1].
 
I have only patched ADFS 1.50 for the Master so far. I have looked
through ADFS 1.30 for the BBC B, but haven't started work on it.
 
HADFS for any 8-bit BBC series computer will access an IDE drive.
Currently, it is limited to single logical drives being a maximum
of 16M. I am carefully working through the code to increase the
sector addressing from 16 bit to 24 bit, so allowing drives up to
2^(24+8) bytes in size - 4G I think.
 
As ADFS on the BBC B pushes PAGE up considerably (six pages, I
think), I think HADFS would be a better filing system to use on
that machine as it only claims one (additional) page of workspace.
That's why I'm concentrating on HADFS at the moment.
 
[1]Of course, there's no software that would access a RISC OS BBC
I/O podule as a filing system - but that's no reason for somebody
to attempt it!
 
-- 
J.G.Harston - jgh@...                - mdfs.net/User/JGH
Sheffield Boundary Review at http://mdfs.net/User/JGH/Docs/Politics/ParlReview