Re: HELP! Apple II files on a Macintosh...

[Jeff Blakeney <CUTjblakeney@syndicomm.com>]

On Tue, 26 Aug 2003 21:22:35 +1200, Jeff Thomas <a2forever@usa.net>
wrote:

>I have a Macintosh with Apple 3.5" Superdrive (1.4Mb), running System
>7.0.1 from the hard disk. Using "Apple File Exchange" [A.F.E] program, I
>can read/write to 3.5" ProDOS, PC and Macintosh disks. Everytime, I copy
>a ShrinkIt or 2MG disk image file to PC disk and load it onto Mac, it
>does 'default translation' that is repeated when transferring from Mac
>to ProDOS disk. Annoyingly, the 2MG files become bigger and refuses to
>fit on ProDOS disk. I tried in vain to disable all translations, but the
>program doesn't allow it.

Are you trying to copy a 3.5" 2IMG file onto an 800KB (double density)
ProDOS disk or are you trying to copy the 2IMG file onto a 1.44MB
(high density) ProDOS disk?  If doing the latter, then there shouldn't
be any space problems and as long as you have the hardware to deal
with high density disk on your Apple II there shouldn't be a problem.

However, as you are having space problems I'm thinking you are trying
to copy the 2IMG file onto a double density disk and that just isn't
going to work.  All 800KB disk images will be too large to fit on an
800KB ProDOS disk if you just try to copy them on as files because the
file itself is at least 800KB in size.  2IMG disk images also have a
header attached to them that makes them more like 801KB in size.  The
largest single file that an 800KB ProDOS disk can hold is 792.5KB once
you take into account the two boot blocks, four directory blocks, one
block for the volume bitmap, one key pointer block and seven pointer
blocks.

The only way you can swap actual disk images of 800KB disks is to get
support for high density 3.5" disks on your Apple II and use those
larger capacity disks to transfer the files or use some other utility
to either copy the files off of the disk images onto 3.5" disks (like
ADFS that has already been mentioned) or convert the disk image into
something like a DiskCopy image and use one of the Mac utilities
(there might be utilities like this for the PC as well, I just can
think of any right now) to write the contents of all the blocks of
that disk image onto a 3.5" disk.

I'm not sure what hardware you have access to but if you have a SCSI
card in your Apple II you could also use practically any SCSI drive to
swap files between machines.  I've used several different types of
SCSI drives to transfer files between machines myself.  Very handy
when try to transfer a large amount of data quickly.

I hope this helps and hasn't been too confusing.  There are probably
other options as well that I didn't think of while writing this up but
at least you now have some info.

-- 
 Jeff Blakeney - Dean of the Apple II University in the
                 Apple II Community on Syndicomm.com
 CUT the obvious from my address if you want to e-mail me