lsr@Apple.COM (Larry Rosenstein) (06/02/88)
I remembered this discussion from a few weeks ago, and for fun looked into
what was going on. (Synopsis: people were wondering about using an LRU
algorithm for ejecting disks in the disk switch dialog. Sometimes you have
2 floppy drives but the system only uses one of them.)
It turns out that the code to allow Command-Shift-0/1/2 during a disk switch
was added to the Mac Plus ROM at the same time that Command-. was added to
abort the disk switch. (You did know that Command-. will abort the disk
switch and return a "volume not available" error, right?)
It turns out, that the code has a bug. Instead of checking for ASCII
characters $30-$32, it checks for $00-$02. (Note that Mac SE & Mac II users
can use Command-Shift-Control-@/A/B to generate these characters and
actually eject the diskettes during a disk switch! I don't have a machine
to try this one, but it should work.)
I was able to write a small INIT file that watches for Command-Shift-0/1/2
during a disk switch and posts a keystroke that the ROM will recognize. I
have tried this on a Mac Plus and it seems to work. I don't have a
Mac SE or Mac II with 2 floppy drives to try it out on those machines.
(I also don't know if it will work on 64K ROM machines.)
Before posting this in general, I would like to have a couple of people try
it out a bit more. So if you have a Mac SE or Mac II with 2 (or 3) floppy
drives, and are willing to be a guinea pig for this, send me mail.
--
Larry Rosenstein, Object Specialist
Apple Computer, Inc. 20525 Mariani Ave, MS 27-AJ Cupertino, CA 95014
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