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Scott Barber blew me away with the news: he has Mac OS 8.1
running on a Macintosh IIsi!
Details:
16 MB RAM required; more is better
80 MB hard drive an absolute minimum; bigger leaves room for
apps
Pseud040 and/or Wish I Were to make the computer appear to have
a 68040 CPU
Warning: you will not be able to do a cold boot from the OS 8.1
drive. You must boot from a version of the Mac OS which supports
your Mac (7.6.1 or earlier for most 68030-based models). This boot
drive (floppy disk, hard drive, partition, removable disk such as
SyQuest or Zip) must have Pseud040 active. After starting from the
old Mac OS, use Restart to boot from the OS 8.1 drive or
partition.
Scott is working up detailed instructions as he configures
another IIsi to do the same thing. I will note that I have thus far
been unable to duplicate his success on my IIfx. However, I will
try it on a IIsi when he releases full installation data.
Once instructions are available, I will link to them from this
page. We will also compile a list of pre-68040 Macs that work with
this procedure. (email Dan Knight
Field
reports welcome.)
Works: IIsi
Probably works: IIci
Doesn't work: IIfx, PB 150, SE/30
Word of warning: be sure you can boot your computer from
another drive (floppy, hard, or removable) if the process fails.
This is especially true if you are using separate partitions on one
physical drive.
One reader suggest you should not change the startup
partition in the Startup Drive control panel, but instead use
shift-opt-cmd-del to boot from the OS 8 partition. (My preference
is to use a completely separate external drive for such
experiments. That way you can turn the drive off and avoid booting
from it.)
For an easier solution, see Born Again:
It Works!. Born Again works with most 68030-based Macs.
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