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Re: Daisychaining 5.25 " Drives

mdj wrote:

David Empson wrote:



I seem to recall there was a modification made to analog controller
board in the Platinum 5.25" drives that allowed them to respond to a ID
request while still essentially being 'dumb' devices


I recall no such feature, and none is required.

The only modification I remember hearing about was a capacitor change in
a DuoDisk to allow it to work on a IIgs without causing problems with
other drives, or something of that nature.




From Tony's site: http://www.apple2.org/A2WebRef/A2Reference05.html


Apparently there was a change to the way the later Smartport firmware
scans the bus, such that ROM03 GS's, IIc+, and LC emulation cards
cannot use drives prior to the Platinum 5.25" drive.


Interesting, since there was never a smartport 5.25" disk drive.
Any identification of 5.25" drives must be done through the
recognition of certain redundant power/ground wires (which were
used differently on different drives).

-michael

New, faster SUDOKU v2.0 solver for Apple II's!
Home page:  http://members.aol.com/MJMahon/

"The wastebasket is our most important design
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