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The Apple ][ Information Resource @ http://www.apple2.org
The UniDisk 3.5" can be used on the following Apple II Systems, and it's
requirements are listed with it.
Apple ][+ : Requires 64K, ProDOS and an Apple 3.5" drive controller.
Apple //e:Requires an Apple 3.5" controller or Apple SuperDrive controller.
The SuperDrive controller requires an Enhanced //e
Universal Disk Controller / Laser 128
The UniDisk 3.5" drive is NOT COMPATIBLE with the Laser Universal Disk
Controller. It will do Bad Things when it's plugged in. Do Not Try It.
Apple //c :Requires a ROM upgrade in older //c units to be installed if it's not
already installed. If the model # on the //c is A2S4000 then it may not have the
ROM installed. To find out, turn on the computer and from BASIC, (the ] prompt)
type 'PR#7'. If the EXTERNAL 5.25" drive 'boots' then it needs the ROM upgrade. IF
the computer says 'AppleTalk offline' it has the ROM installed. If no external drive
is installed and no AppleTalk message appears you still need the newer ROM.
Another way is to turn on the computer, when you can see the monitor hold down
both the Open and Closed Apple keys. (Opposite sides of the spacebar) and hit CTRL
and RESET. If the computer goes into a checkerboard type pattern you have the new
ROM installed. If the computer goes to an alternating vertical line pattern with a
click between each alternation. (Turn up volume, on left side, under keyboard). You
will need a ROM upgrade. The part # for this ROM upgrade is 342-0033.
Apple //c+: Nothing additional is required to use the UniDisk 3.5" with an Apple
//c+.
Apple IIgs: No additional hardware is required to use the UniDisk 3.5" with an
Apple IIgs directly although you can use the UniDisk 3.5" with either an Apple 3.5"
controller card or Apple SuperDrive controller in the slot of an Apple IIgs. The
UniDisk normally plugs into the floppy port of the Apple IIgs.
Important Note: The UniDisk is not the recommended 3.5" drive for use with an
Apple IIgs although it will work fine for normal usage. It will be slower than using
the recommended drive, the AppleDisk 3.5". It looks similar to the UniDisk 3.5" and
is the same color as the Apple IIgs itself. Using a UniDisk on a IIgs while using any
GS specific software that runs under GS/OS will require that a device driver be
installed on the boot volume as well. The driver, titled 'UniDisk.3.5' can be found
on the system disk set and be installed using the installer on the System Tools disk
of System Disk 5.0.4 or the Installer disk of System 6.0. Using the UniDisk on the IIgs
will also be slower than using the proper 3.5" drive and some disk based software
from such groups as the FTA may simply not run.
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