It depends on the machine and the configuration. IIRC,
the earlier
Yes, you're right. The only Mac I have any real hardware experience of is
the Mac+. IIRC, you can use a 400K drive with that using a all-pins-wired
ribbon cable, but if you use the standard 800K drive, you need a cable
with 1 or 2 pins open.
machines had regular 20 pin cables, but then certain
combinations of
disk drive and computer needed the "yellow stripe" cable, as opposed to
the "red stripe" one. >
I also seem to remember something about pin 9 needing
to be
disconnected as well, but I can't for the life of me remember what that
was.
I think one of the pins was a -ve power supply rail (-5V? -12V?)
A similar trick was needed to use an 800k drive on a
machine with a
SuperDrive controller (MacII, etc)
Right... this is something to be aware if you're working on such
machines. I am so used to seening IDC ribbon cabels where all pins are
wired and where there are no 'dummies' in calbe that I was very suppised
when I figured out what the Apple drvie cables were doing.
-tony