Select boot volume on startup

[pcamen]

Seems like this would be easy to find, but I am stumped.  How can I select the startup volume (multiple partitions on a single SCSI ID) at startup on an SE/30?  I've got a damaged system folder on the first partition and a new 7.1 install on the second. 

 

[Dog Cow]

I have not verified this information:

An old Usenet post from 1991 said that PRAM only stores the SCSI ID #. Partitions are scanned in alphabetical order, so rename the partition that you want to boot from, to come first.

 

[LaPorta]

I don’t know that that is possible. I’d recommend just start from a floppy, fix the broken system, or just I’m use the floppy’s Startup Disk control panel to select the correct partition. There were key commends to select a particular SCSI drive, but partition? Not sure

I just double-checked my MacSecrets books. Command-Option-Shift-Delete should make it ignore the HD entirely, and add a number to that to start from a specific SCSI ID. If you have an external SCSI drive you’d want to use, add it’s SCSI ID to that command to start from it.

 

[KnobsNSwitches]

System Picker https://macintoshgarden.org/apps/system-picker should be just what you need!

 

[LaPorta]

That works wonderfully normally, but if he is stuck in a startup loop, he can’t use that.