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With Asimov you can create disk images for use with all the Apple II emulators out there. You can also write data from disk images back onto a “real” disk (i.e. 5.25" floppy, 3.5" disk, ProDOS harddisk, ...)
Asimov uses the Universal Disk Image format (also known as the 2IMG format) as its primary format for disk images. In addition, Asimov can handle most of the other Apple II disk image formats as well.
Asimov requires an Apple IIGS and GS/OS.
It does not work properly on Bernie II The Rescue (Macintosh) and Sweet 16 (BeOS), two famous Apple IIGS emulators. We haven’t been able to test it with KeGS yet, another GS emulator available for UNIX machines.
Afer you have launched Asimov, you will be presented with the following options:
Displays credits. Read them carefully.
Create IMAGE from disk...
This will read out a GS/OS volume and write it to an image
file. Asimov supports all volumes that are available under
GS/OS. You can choose the type of disk image you would like to create. See below for further details.
Create DISK from image...
Lets you choose an image file to write to a volume. Depending
on the image file, only volumes of the proper size can be
written to. Example: an 800k disk image will only fit on a
See below for a list of image types that Asimov can handle.
When you select a 5.25" raw disk image, you will be asked to
specify the order. See below for details on DOS order .
Quits the program. You can quit to the launching application,
restart the system, or hardboot a specific slot. The latter
means that the Startup Slot in the GS Control Panel will be
set to the slot you choose before the system will be
Disk image types
The following is a list of image file types that Asimov can create and read. Please note: nibble images are not supported.
Universal Disk Image
This is the common standard among Apple IIGS emulators
nowadays. The format can handle all sizes of disks: 5.25"
floppies, 3.5" disks, harddisks, etc.
Recommendation: Use this format for all except 5.25" disks!
Possible filename suffixes: .2IMG, .2MG
Raw Data Image
Simple and thus popular among Apple II emulators, this image
type is just the plain disk data written to a file. Please
note: DiskCopy 6.0 images are also Raw Data Images.
5.25" floppy disk images are treated in a special way: because
this image format lacks the ability to store additional
information, the user needs to know which order the image is
stored in: DOS 3.3 order or ProDOS order. The different orders
come from the fact that DOS 3.3 maintains a different disk
layout as ProDOS. Sometimes the format can be distinguished
from the filename suffix, where .DO means DOS 3.3 order and
.PO stands for ProDOS order. Asimov will let you choose the
order but give a recommendation. Out of tradition, most
images are DOS 3.3 order.
Recommendation: Use DOS 3.3 order for 5.25" disks only!
Possible filename suffixes: .DSK, .RAW, .DO, .PO
Disk Copy 4.2 Image
This is an obsolete image type, but you might still come
across such image files.
Recommendation: Do not use this format to create images.
Possible filename suffix: .DC