Changing boot drive at startup

I have a loan of a PBG3, 300 MHz running System 9.2.
I have a scsi adaptor for it.
I have multiple scsi drives, both external and internal from (1) a IIsi and (2) a performa 6300 CD.
I could not get the IIsi to boot. However, the drive was spinning up, so I was hopeful that if I put it in an external enclosure and attached it to a computer that talks scsi, that it would come up. It tries to. In fact, it tries to snatch the boot from the PBG3, whereupon I get a message saying that the PBG3 can't run that old an operating system.
I just went and looked at the pdf of the manual that is on the apple website. It did not deal with this issue. Does anyone out there know if there is a set of keys that I can hold down to force boot drive selection at startup, before the external tries to hijack the boot? I checked, and the startup drive appears to be listed as the powerbook. At least, it is selected when I look at the control panel.
I plan to go through the same process with the performa drive. I'm pretty sure it's running 7.6, (the IIsi probably has 7.1 on it), so I'll probably have the same problem.
Sharon

It tries to. In fact, it tries to snatch the boot from the PBG3, whereupon I get a message saying that the PBG3 can't run that old an operating system.
Macs will seldom run any OS older that what they shipped with. The oldest OS shipped with the earliest Wallstreets G3s was 8.1; yours probably shipped with something newer. If you really need to boot those drives, they will have to be attached to an older Mac.
According to the MacTracker database, the 6300 has an ATA drive. Much easier to deal with if you only need to recover files. A gadget like this:
http://eshop.macsales.com/item/Newer%20Technology/U2NV2SPATA/
allows you to connect a bare drive to any USB-equipped computer.

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