Macintosh Plus: Allow 30 Seconds for SCSI Devices to Start Up


I have four SCSI hard disks daisy chained to a Macintosh Plus. On startup,
only some of the hard disks mount, though they all mount when hooked up
individually.

I've removed all internal terminators and replaced them with external
ones, disabled all INITs, and checked the SCSI device numbers, all to no
avail.

This is a problem cause by the relatively slow speed of Macintosh Plus
computers with old-style ROMs. All SCSI devices must be in the ready
state before the computer or they won't be recognized. Be sure to wait
around 30 seconds after turning on your hard drives before turning on the
Macintosh Plus. You also might consider upgrading your Macintosh Plus'
ROM.

Also, just for the sake of consistency, standardize on one brand/type of
SCSI terminator.


Published Date: Feb 18, 2012