Macintosh Plus: Control Panel Startup Device Not Available



The Startup Device does not appear in the Control Panel on Macintosh Plus
systems. This happens with System 4.3 and with System 6 and later. And using
System 7, there is no Startup Disk control panel available either. I have two
hard disks and want to choose which one should start up first.

That behavior is correct. On Macintosh Plus or earlier Macintoshes, the
Startup Device module of the Control Panel does not appear while running System
6.0.X or earlier, nor does the Startup Disk control panel appear while running
System 7 or later. The SCSI firmware is different on the Macintosh Plus and
does not allow for the same flexibility that later Macintoshes provide. The
SCSI device with the highest SCSI number will be the first device to boot (note
that an internal hard drive will take SCSI ID 0, while the Macintosh itself
will take SCSI ID 7).

For more information, see chapter 18 of "Inside Macintosh Volume V,"
specifically page 325.


Published Date: Feb 18, 2012