31 Oct
2000
31 Oct
'00
7:13 p.m.
On Oct 31, 22:07, Claude.W wrote:
[ Attachment (multipart/alternative): 3891 bytes ]
(BTW, please don't post HTML to the list)
Used a driver that sees cdrom drive (icon with scsi id
for drive appears
=
on os startup) as soon as iso9660 format cd is
inserted, it reports that
=
it cant read the disk, it reports the size of the data
used up on disk =
and asks if I wanna format it or eject it...
Probably the block size. The older Macs require the blocksize on the CDROM
to be set to 512 bytes, as do older Suns and SGIs (newer machines work with
normal 2048-byte blocks, and issue a SCSI command to reset the size). To
fix this requires some minor surgery on the drive. This works for XM3301
and XM3401, but not XM3601 or later, BTW. I believe it works for XM5401
but I can't be sure about others.
On the 3301/3401 PCB, there are two solder pads near the rear right corner.
Each looks like two semicircles bridgeed together, and they might be
labelled 0 and 1 -- if not, 0 is the one nearest the edge of the PCB. The
default setting (for PCs) is for 2048-byte blocks. Cutting the bridge
between the two halfs of either or both pads gives you 512-byte blocks; the
resulting three possibilities are supposed to be for different systems:
open, open Sun bootable
open, shorted SGI bootable
shorted, open generic 512-byte
shorted, shorted normal 2048-byte (default)
I've fitted a DIP switch to all my old Toshibas, so I can move them between
systems fairly easily.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York