AUX and Mac OS

[Steve Lemke]

In article <89325.135151DN5 at PSUVM.BITNET> dn5 at psuvm.psu.edu writes:
}
}Is it possible for a single Mac II to run both Mac OS and AUX?  Not at the
}same time, but be able to choose between the two operating systems at
}startup time?
}
}                               D. Jay Newman
}                               dn5 at psuvm.psu.edu

Yes, I do this at home - I have a 140mb internal drive with Mac OS on it,
and I have an 80mb external with A/UX.  I have a normal SCSI cable going
from the Mac to the external drive, and an external terminator on it as well.
The reason I mention this is to tell you a slick way to switch back and
forth with minimal hassle.  Turn both drives on, and boot from the internal.
This should happen by default.  Then pull down the control panel, and set
the startup to the A/UX drive.  From here on out, when you want to boot
A/UX, turn the A/UX drive on before turning on the Mac, or if the Mac is
already on then turn on the A/UX drive and do a restart.  If you want to
boot MacOS, just leave the A/UX (external) drive off while you boot.  The
Mac will look for the external drive but since it's not on it will boot the
internal drive anyway.  If you're running A/UX and want to go back to MacOS,
do your "sync;sync;sync;shutdown", and when you get back to single user
mode, do "sync;sync;sync;reboot".  The drive will run for about 30 seconds,
after which the machine will chime and restart.  Turn the drive off right
when the Mac chimes the startup chime.  With practice, you can learn to
identify when the drive stops and is about to reboot, and it can be shut
off just before the chime.

I've been doing this for almost a year now without any problems.

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----- Steve Lemke, Engineering Quality Assurance, Radius Inc., San Jose -----
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