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With GS System 6.0 and 6.0.1, the GS gained the ability to read and
write Macintosh 800K and 1.44MB floppies from within all programs, not
just the dedicated transfer programs mentioned above for pre-GS
machines. (1.44MB disks require some additional hardware, such as the
Apple 1.44MB Superdrive and Superdrive controller, the Bluedisk, or
SCSI Floptical drives). Use the System 6 installer (select 'Custom'
install to get the list of addons) to install the HFS (Macintosh) FST
on your boot disk, then reboot to load it. It may be a bit of a
squeeze to fit the HFS FST and such on a 800K boot disk, and GS System
6.0/6.0.1 pretty much requires at least 1-1.25MB RAM to do stuff.

System 6.0.1's optional MS-DOS FST allowed read-only (not write)
access to MS-DOS formatted disks, though disks with Windows 95's VFAT
extended names will not have the long names displayed. The GS's normal
800K drives are not capable of reading MS-DOS 720K or 1.44MB disks
directly; you will need to get a 1.44MB capable drive, as listed in
the paragraph above.

For the ability to write to MS-DOS disks, you will need Peter Watson's
(email: [email protected]) MSDOS utilities (latest version is 2.30),
which can read/write MS-DOS formatted disks, both FAT (pre-WIN95) and
VFAT (WIN95) disks, including Zip disks. It's not currently usable
from within the Finder or other programs, but you need a program shell
such as that included with The Byteworks' Orca series, Procyon's
GNO/ME, ProSEL-16's shell, or the minimal shell included in the
msdostools package.

ftp://ground.isca.uiowa.edu/apple2/apple16/utils/MSDOS.util/MSDOS.TOOL
S.SHK

System 6.0 also added read-only support for Dos 3.3 and Pascal 140K
disks. The Pascal FST in System 6.0.1 (and probably 6.0 also) will not
recognize disks with legal punctuation in the disk name; Nathan
Mates's GUPP program fixes that. See the System 6.0 mini-FAQ in this
FAQ for details on where to download GUPP.

5.9 How do I read/write Apple II files from a Mac?

If you can read/write Apple II 3.5" disks, Macs can usually read/write
to them, but please note the many quirks noted below. Apart from the
Apple //e emulation card (see below), Macs never really had 140K 5.25"
support. Using a null modem is almost always an option; see above.

With Mac System 7.5 and up, the Control Panel 'PC Exchange' lets
inserted ProDOS and MS-DOS disks appear on the desktop and copy files
to and from them, making the procedure rather simple. Before 7.5
(starting somewhere in Mac System 5 or 6 series), the program 'Apple
File Exchange' was bundled on the system disks; it could manually (and
very slowly) copy individual files, but only from within Apple File
Exchange. Consult the system software disks for your Mac if you can't
find these programs.

Macs downloading to Apple II disks to be read by ProDOS 8 applications
is usually not an issue of directly dragging a downloaded file to the
destination disk. Despite the claims of 'compatability' or 'ease of
use', you're likely to need a special program to help to get a ProDOS
8 program such as BASIC.SYSTEM for Binscii, Shrinkit 3.4, Appleworks,
etc., to read the files. [GS/OS can deal fine with the additions to
the file, but if you're trying to get the ProDOS 8 version of binscii
running, that is no help.] The usual symptom of this problem is a
'FILE TYPE MISMATCH' error on trying to read the file.