Date   : Thu, 24 Aug 2006 01:13:23
From   : jgh@... (Jonathan Graham Harston)
Subject: Re: writing and reading on 3.5 floppy

>Message-ID: <BAY105-F24DFEECD3F1894A3542A6DD1460@...>

"salahdin mahmud" <tbkc@...> wrote:
> I have heard of a patched dfs 1.21 but hav also tried 3 *fx commands which
> according to sprow do the same timing trick. I have tried the fx commands
>
> So does the patched dfs do a lot more than the *fx commands and wsill it
> enable me to save and load games to the sony floppy drive?

There is no such fx command that does what DFS 1.21 does, which is
ignore Disk Error 10 - Drive not ready. The *fx255 command changes
the drive stepping speed.

There seems to be such confusion and counter-arguments about what
happens to cause the Disk Error 10 that I have removed such
explanations and now just refer to "Disk Error 10 occuring when
using 3.5" drives".

It changes some code from:

DEC tries
BPL TryAgain
JMP ReturnError

to:

DEC tries
BPL TryAgain
JMP CheckError
...
.CheckError
CMP #&10
BNE JumpBack
JMP ReturnError
.JumpBack
JMP TryAgain

so that whenever the low level code return result=&10 it ignores
it and tries again.

See http://mdfs.net/Apps/Filing for DFS 1.21


--
J.G.Harston - jgh@...                - mdfs.net/User/JGH
BBC BASIC for 30+ platforms - http://mdfs.net/Software/BBCBasic