Re: Apple 5.25" drive vs Unidisk 5.25"

["David Wilson" <mcs6502@gmail.com>]

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.