At 02:11 7/18/2001, Meikal Oestebo wrote:
>Meanwhile, can you/someone tell me, does that floppy connect directly to the
>riser card? Or does it daisy through the internal CD-Rom drive and then to
>the card? The CD-Rom is scsi same as the floppy??? If so, is it possible
>the cd-rom could in some way be at fault?
No Mac has ever used a SCSI floppy drive. They all have their own special
connector and bus for the floppy drive which is not part of the SCSI bus
and is not a part of the IDE bus.
I don't know where that connector is located on the C500.
The CDROM is SCSI. The floppy is not.
Actually, the floppy controller goes all the way back to Steve Wozniak and
is called the Super Wozniak Integrated Machine or SWIM. Now days (or back
before floppies were discontinued) the SWIM had been integrated into a
larger chip, but it was still a separate entity up until the last couple of
model cycles.
In the original Mac, the Mac Plus and the original Mac II, and the SE it
was the IWM or Integrated Wozniak Machine and only supported the 800K
diskette. However, that was an improvement over a standard 3.5" floppy
which ordinarily got only 720K of capacity. That was part of Wozniak's
magic at work.
When Apple went to the SuperDrive (1.4 MB) also known as the FDHD, the SWIM
was invented and one could upgrade the SE and the Mac II to the larger
capacity floppy by switching the floppy and also replacing the IWM with the
SWIM. In those days the chips were in sockets, so they were fairly easy to
replace. One also needed a ROM replacement to make it work.
Jeff Walther
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