Date   : Tue, 17 Jan 2006 00:27:30 +0000
From   : jgh@... (Jonathan Graham Harston)
Subject: Re: DNFS 1.21 on 8k eprom

Paul J <peterbilt@...> wrote:
> I want to burn DNFS 1.21 (the patched version for 3.5 drive) on my current
> dfs eprom containing DFS 0.9. The only problem is 1.21 is 16k, and 0.9 is
> 8k. Is it possible to split NFS from the DNFS 1.21 rom image so I can fit
> DFS 1.21 on an 8k eprom, I don't have any spare 16k eproms and my machine
 
No.
 
It's only possible to split DFS from DNFS, not split NFS from
DNFS. NFS is in the bottom half of the ROM from &8000 to &9FD0.
The half-ROM puts RTSs at the start of the DFS code at &9FD0 and
ends the ROM at &9FFF. You couldn't even fit the DFS into an 8K
ROM as the code is slightly longer than 8K - it runs from &9FD0 to
&BFFF. You would also lose the Tube support at &9321 to &9660.
 
I'll give you some 16K EPROMs for postage or, even better, some
DNFS 3.01 (DFS 1.21+NFS 3.60) EPROMs.
 
-- 
J.G.Harston - jgh@...                - mdfs.net/User/JGH
Opposition is about asking questions, and Government is about not answering
them.