--- "r. 'bear' stricklin" <red_at_bears.org> wrote:
> On Tue, 17 Sep 2002, Carlos Murillo wrote:
>
> > The machine thinks that there is a floppy disk in the superdrive
> > constantly...
>
> Something fried the disk controller. I did this to one of my SE/30s once
> by being cavalier about not shutting the machine off before connecting
> and disconnecting an external disk drive.
>
> I suppose it goes without saying that the floppy controller is not a
> standard part.
Well... it's standard to Apple... there's a chip on there marked
"IWM" - Integrated Woz Machine. That's the "floppy controller", though
I'm not certain that 100% of the floppy functions are performed by
that chip (thinking of the Amiga where it takes two or three chips
to run the floppies - Paula, an 8520, and Gary (if present)). There
might or might not be some control-line stuff and/or analog stuff
external to the IWM. AFAIK, it's the IWM that controls the data
clocks and handles the number of sectors-per-track changes, among
other functions.
Best bet is a replacement motherboard. Second best bet is to pull the
IWM from your SE/30 board and from another board and install a socket
before installing the replacement.
-ethan
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Received on Tue Sep 17 2002 - 14:42:00 BST