[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Apple 5.25" drive vs Unidisk 5.25"

David Wilson wrote:

Michael J. Mahon wrote:


That's *very* interesting, since the drive is just hardware.  ;-)

There must be some line used for smartport signalling that it leans
on too hard...?  Since it apparently *works* with the ROM01, it could
be a signal loading issue, where the ROM3 tightened the timing...or
what?



I wish I could recall where I found this information originally. I am
sure it was a software change in the ROM03 firmware.
I think (but am not sure) that there may be an extra chip on the Apple
5.25 drive PCB that is not present on the UniDisk 5.25. As for the
DuoDisk, I do not know if it works the same way or not. I have an Apple
5.25 and a DuoDisk and both ROM01 and ROM03 IIgs systems. I will have
to test this.


It would be interesting to know.

I've always regarded the various generations of Apple 5.25" disk drives
as an exercise in repackaging.  ;-)

-michael

Parallel computing for 8-bit Apple II's!
Home page:  http://members.aol.com/MJMahon/

"The wastebasket is our most important design
tool--and it is seriously underused."