Re: SCSI HD IIGS: Question - How to boot both 8-bit and 16-bit software?

[dempson@atlantis.actrix.gen.nz (David Empson)]

In article <Cyo50w.L7G@ssbunews.ih.att.com>,
J. L. Walters <bird@nwsrs.nw.att.com> wrote:

[Booting directly into ProDOS-8 via copied P8 file in root directory.]

> Jay Krell, and others, seem to feel that what I'm doing is the wrong
> way to go about it. They feel that I should boot GS/OS and then select
> AppleWorks from the finder &/or Transporg (GREAT program!). I have had
> serious problems with this procedure in the past. It seemed to me that
> certain NDAs/CDAs didn't get the message that they were no longer
> needed when going to 8 bit and kept running and caused me grave
> problems in AppleWorks Classic.

Which version of AppleWorks?  AppleWorks 2.0 had a strange bug: it
tried to start up any IIgs New Desk Accessories (which aren't exactly
useful in an 8-bit text environment).  This causes crashes in some
cases, but can be avoided by booting ProDOS-8 directly, or by
upgrading to AppleWorks 2.1 or later.

> Finally, the procedure I've outlined above is not without problems from
> time to time. It seems that after some number of boots of ProDOS 8,
> enter AppleWorks, boot GS/OS, Restart to ProDOS 8,... GS/OS becomes
> somewhat screwed up i.e., won't boot, falls into the monitor, STRANGE
> looking menus in the Finder, etc. My guess on this subject is that
> AppleWorks is somehow munging something that GS/OS thinks is golden on
> boot.

How are you restarting each time?  I haven't used this method for a
while, but you would definitely have problems if you used the
following sequence:

1. Initial boot into ProDOS-8
2. Launch the GSOS file to start up GS/OS
3. Launch a ProDOS-8 program from GS/OS
4. Launch the GSOS file to get back to GS/OS

If you rebooted the computer between steps 3 and 4 (via
Ctrl-Apple-Reset), it should be OK.  It should also be OK if you use
"Shut Down" or "Restart" to get from GS/OS back to ProDOS-8.

A possible problem is extensions which hook into low-level system
vectors and aren't cleared by Ctrl-Apple-Reset.

These can usually be removed by starting a self test
(Ctrl-Apple-Option-Reset) then immediately rebooting.  The memory
manager will be reinitialized, as will the RAM disk.
-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand