Re: Using 3.5" Drives (or CFFA) with 5.25" DOS3.3 Disk Images ?Directly

[Andy McFadden <fadden@fadden.com>]

Warren Ernst <wernst@gmail.com> wrote:
> I've since been searching the archives via Google, and it seems as if
> my answer will be "not bloody likely." The various DOS 3.3's that work
> with 3.5" disks aren't easily readable by utilities like Copy II + or
> the Finder, so it doesn't seem likely that any disk decompression
> utility would either.
> 
> I have been reading up on Glen Bredon's DOS Master and while it makes
> putting hundreds of DOS 3.3 volumes on a CF card with the CFFA, the
> processes of copying many games over looks torturous.


CiderPress will recognize an 800K 3.5" disk image with different sorts
of DOS volumes (two 400K images, multiple 140K DOS Master images, five
160K images, etc).  It doesn't recognize a large DOS Master zone on a CF
partition because, well, I never got around to implementing that.

(There's always a lot of hand-waving because it's just a big range of
blocks that are marked "in use" but have no file associated with them.
You have to scan for the blocks, assume it's DOS Master, scan through it
to figure out how many and how large the volumes are, etc.  Having them
on an 800K image sort of limits the scope.)

Anybody who wants to add "large volume DOS Master" support is encouraged
to examine DiskFSProDOS::ScanForSubVolumes() in diskimg/ProDOS.cpp.
The handy part is that the diskimg library can be built and used under
Linux with the supplied command-line utilities (makedisk, getfile, mdc),
so you don't even need a bunch of Microsoft software to work on it.

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