Re: ROM 3 IIgs, Sticky Keys, and a Zip GSX = ERROR $0911

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

In article <37g690$k79@kaiwan009.kaiwan.com>,
Mark Miller <markm@kaiwan.com> wrote:
> A friend of mine discovered an interesting bug related to the above
> setup.  On a ROM 3 IIgs with a Zip GSX with a speed of at least 12MHz
> do the following from any application:
> 
> 	Set Zip GSX speed to 12MHz (or close to that)
> 	Activate CAPS LOCK
> 	Activate Sticky Keys (press SHIFT 5 times)
> 	Reboot (press each key separately: CTRL-COMMAND-RESET)
> 
> Ta-da!
> 
> ERROR $0911

Hey, wow!  This is probably a _real_ case of a synchronization error
between the IIgs and the keyboard micro (rather than a heat-induced
glitch).

Does it actually reboot before reporting the error (i.e. do you get
the "Apple IIgs" title, or at least two beeps?)

Without disassembling the relevant code, I don't have any immediate
ideas on why it might be causing an error.  The only thing that comes
to mind is the keyboard micro may be taking a little time to
reinitialize, and the IIgs isn't waiting long enough.  The keyboard
micro probably thinks the reset key is still down.

I don't have an accelerator at the moment, so I can't try it myself.
Not exactly hard to avoid, unless you are disabled and need sticky keys.

-- 
David Empson
dempson@actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand