This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
You can boot a decent System 5.0.4 or very modest System 6.0.1 from a 3.5"
diskette. With two 3.5" drives, you can boot a decent System 6.0.1; but, disk
swapping becomes a significant hassle when you want to run most
applications.
A much better solution is available if you have a 4MB mem expansion card
installed. (Actually, you can make do with about 2.5MB of RAM.) You can use a
utility named "Flash Boot" by Jerry Kindall. Flash Boot auto-loads System from
one or more 3.5" diskettes to /RAM5 RAM disk and boots it.
What you do is create a large enough /RAM5 to hold the System you want to
boot. Next, you boot System as usual from diskette(s) and use the Flash Boot
utility to prepare /RAM5 and install the auto-loader. Then, you copy the stuff
you want to auto-load to /RAM5 and use the Flash Boot utility to create one or
more 3.5" "image disks".
To install and boot System you start by booting from the first image
diskette and feed in any others as prompted. System then boots from /RAM5 and
works very much as though it were on hard disk.
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