Author: Guillermo Ortiz
Year: 1986
... described a bug of SANE on the Apple IIGS which caused it to jump through location $00/0018 instead of through the HALT vector in the SANE direct page.
Apple II
Technical Notes
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Developer Technical Support
Apple IIGS
#7: Halt Mechanism in IIGS SANE
Revised by: Guillermo Ortiz & Matt Deatherage November 1988
Written by: Guillermo Ortiz December 1986
This Technical Note formerly described a bug of SANE on the Apple IIGS which
caused it to jump through location $00/0018 instead of through the HALT vector
in the SANE direct page.
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The bug which caused SANE on the Apple IIGS to jump through location $00/0018
instead of through the HALT vector in the SANE direct page was fixed in the
Apple IIGS ROM 2.0. You should not have to write a special case to handle
this bug since it is reasonable to expect users to have the updated ROM which
is offered as a free upgrade from Apple.