SCSI LS-120 Superdisk drive on an Apple IIGS

[lemonherb1@netscape.net (Herbert Fung)]

OK, today I made time to test a SCSI LS-120 Superdisk drive on an
Apple IIGS, running System 6.01 with the MS-DOS and HFS FST's
installed.

Hardware used:

Apple IIGS ROM 01
4MB RAM
Apple High Speed SCSI card
SCSI LS-120 Superdisk drive
CFFS with 128MB
15MHz TWGS 32k cache with 1.8S firmware

Here's what I found:

720k MS-DOS disk reads fine
1.44 MS-DOS disk reads fine
120MB MS-DOS disk fails to mount

800k ProDOS disk fails to mount

1.44 HFS disk fails to mount

I didn't have any unformatted disks so I couldn't try one, but I did
try to re-format the MS-DOS disks that did mount. With both the double
density and high density disks, attempts at re-formatting failed.

In each attempt, the disk formatting dialog box only offered 1MB
volumes. The only variations is the interleave 1:1 or 1:2, and the
file systems, HFS or ProDOS. I tried every selection and the
formatting failed. Of course a double sided density disk can't
possibly be formatted to 1MB so I presume this is one of the reasons
it failed, but I can't figure out why the high density disks didn't
work.

So those who want to try to use an LS-120 drive, only the SCSI version
works, but only for reading MS-DOS formatted disks, and even then,
only double density and high density disks, not the 120MB disks.