🚀 go-pugleaf

The old HyperDrive stuff *almost* works with the newer systems.  For
example, if you boot from a floppy and then examine the drive queue,
you will find that there is an entry in the drive queue for the
HyperDrive stuff.  However, the driver reference number is -1.
This is why you can't mount any volumes: the driver reference number
is bogus.

I once wrote an INIT that found the HyperDrive entry and patched the
driver reference number to be the correct value, and I could then
use my HyperDrive with System 5.whatever.

I think that the problem has something to do with the drive number.  The
HyperDrive likes to use 64 as the drive number.  There is something in
later Macintosh system software that does not like high drive numbers.
I don't know what it is, but I too ran into it when I was working on
a SCSI disk driver.  My driver liked to pick drive numbers around 108,
and it failed to work right.  Changing it to prefer low drive numbers
caused it to work.

I think there was a tech note or an article somewhere or something like
that once that mentioned what is wrong with large drive numbers, but I
don't recall where it was.

I would guess that HyperDrive would work fine with System 6 is someone
could find the place where it assigns the drive number and patch this
to use a lower number.  Is this in the HyperDrive ROM, or is this in the
driver that is installed into the System file?  If the later is the case,
then it should be doable.

						Tim Smith