On Dec 6, 2005, at 12:20 PM, Warren 'Llama' Ernst wrote:
I seem to recall reading somewhere that the Rom03 GS machines don't
play nicely with the Beige 5.25" disk drives (the so-called UniDisk
5.25" drives). Platinum 5.25" drives (the so-called Apple 5.25"
drive) is supposed to work fine on both Rom01 and Rom03 GS machines.
Can anyone confirm or deny this?
My recollection is that the UniDisk 3.5 drives WILL work on any IIGS,
but the Apple 3.5 drives will NOT work on the II Plus, IIe, or IIc
(although they might on the IIc Plus. It has to do with the UniDisk
3.5 drives being "smart" drives, with their own 65c02 processor, and
the Apple 3.5. drives being lobotomized (i.e., NO 65c02), and so the
byte encoding and decoding has to be done by the host computer rather
than within the drive.
The UniDisk 5.25 and Apple 5.25 drives, on the other hand, did not
require any extra processing to use; an Apple 5.25 drive is different
only in its daisy-chainability, and is otherwise electrically the
same as the original (Alps? Shugart?) Disk II drive for the Apple II.
-------------------------------------------------------
Steven Weyhrich <IX0YE>--<
Apple II History
http://apple2history.org
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