Date   : Wed, 29 Oct 2003 10:51:02 +0000 (GMT)
From   : Sprow <info@...>
Subject: Re: NFS 3.60 ROM and the Electron

In article <10310282330.ZM17351@...>,
   Pete Turnbull <pete@...> wrote:
> On Oct 28, 14:26, <chris.johns@...> wrote:

> > >> I've been looking at the NFS 3.60 ROM (the 8K version)
> > > I thought 3.60 is combinated with the DFS, and 3.34 is the only 8K
> > > device for NFS, but no doubt I must be wrong.
> >
> > I think this is acrually half the DNFS
>
> AFAIR this was not officially available from Acorn as an 8K ROM, but if
> you knew the right people...  It is indeed the bottom half of the DNFS
> ROM, but slightly modified.  And, indirectly, that's why you see so
> many Tube addresses.  The Tube code resides in the NFS half of the DNFS
> ROM; the DFS part fills its 8K but the NFS takes a good deal less than
> 8K.

Well I'm duly seriously impressed that NFS + Tube support fit in 8k!

> In answer to Sprow's almost-question, yes, NFS contains the Tube code
> (even in NFS 3.34), though it was also in the 1770DFS in later
> machines.

Found it now.To answer my (own) other question the Tube ULA in an Elk is
defined at &FCEx rather than &FEEx on the other machines - thus a search and
replace may help there,
Sprow.