Date   : Fri, 31 Dec 2010 22:38:22 -0000
From   : jumbos.bazzar@... (Mark Haysman)
Subject: Patching a CF card patched ADFS

Hi Mick.

JGH will probably add more info to this, but his original patcher for ADFS 
1.53 is here:

http://mdfs.net/Info/Comp/BBC/IDE/

and I've uploaded the patch for 1.33 (the fixed version that works with the 
CF) here:

http://www.retroclinic.com/misc/ideptch133_fixed.zip

That should get you started on what to modify.

Mark.

----- Original Message ----- 
From: "Mick Champion" <rs423@...>
To: "BBC micro mailing list" <bbc-micro@...>
Sent: Friday, December 31, 2010 10:27 PM
Subject: [BBC-Micro] Patching a CF card patched ADFS


> Hello all,
>
>
> Having recently purchased a retro clinic CF hard drive kit, I'd be very
> grateful for a few pointers as to how I can further patch the already
> patched CF ADFS. This in order to run an original ADFS and patched ADFS
> at the same time (although obviously not paged in at the same time). To
> be clear, I want to hang the CF HD and ST506 HD's on the same cable and
> switch between the ADFS versions to copy files from my one remaining
> good hard disc before it's too late. Drive 0 died just over a week ago.
> I think one of the heads fell of based by the hair raising screeching
> sound it made :-(
>
>
> First the easy bit.  How do I change the filing system number on the
> patched ADFS from 8 to something else? This so the highest priority ADFS
> doesn't stop calls getting to lowest priority ADFS.   Senile bloke here
> can't remember how he did this in 2004 for the patched ADFS on GoMMC.
> Is it just a single byte in the ROM header that needs altering? If so,
> the byte I'd need to alter would be really good to know. Is that all I'd
> need to do to access both versions of ADFS? So far, all I've managed to
> do is get CF ADFS to respond to *CFFS. *ADFS gives "Bad command" despite
> being installed lower down the pecking order. I presume as CF ADFS is
> answering all calls to file system 8?
>
>
> Secondly the harder bit I guess. The hard disc is fixed at &FE40 - $FE47
> on the 1Mhz bus address . Normally the CF HD is too, however I have been
> given an alternate 1Mhz bus PAL (cheers Mark) for the CF hard disc. That
> PAL alters the CF HD bus address to &FE50-&FE57. Would it be a simple
> matter to patch CF ADFS to work from the higher address? I'm happy to
> patch the ROM myself if I knew where to peek and what to poke it with. :-)
>
>
> Thanks in advance and happy new year to all,
>
>
> Mick.
>
>
>
>
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