Apple II
Technical Notes
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                                                  Developer Technical Support
Apple IIgs
#102: Various Vectors

Revised by: Dave Lyons                                               May 1992
Written by: Dave Lyons                                          December 1991

This Technical Note describes system vectors that are not fully described in
other documentation.

CHANGES SINCE DECEMBER 1991:  Added information about the TOBRAMSETUP vector.

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THE TOBRAMSETUP VECTOR

The TOBRAMSETUP vector is documented in Appendix D of the Apple IIgs Firmware
Reference.  Two clarifications are needed:

   o   TOBRAMSETUP must be called in 8-bit native mode (SEP #$30).

   o   Before System 6.0, TOBRAMSETUP required that the Bank register be $00
       (bad things would happen if it was not).  This requirement is gone in
       6.0.

THE MOVE_INFO VECTOR

MOVE_INFO is a flexible, low-overhead data transfer routine.  It can transfer
buffer-to-buffer, buffer-to-location, location-to-buffer, and buffer-to-buffer
reversing the order of the bytes.

Apple IIgs GS/OS Device Driver Reference  tells you how to call MOVE_INFO from
a GS/OS driver environment (JSL to $01FC70), but this requires the
language-card RAM to be banked in correctly.

Another vector points to the same routine:  $E10200.  If you aren't a GS/OS
device driver, it is more convenient to JSL to $E10200, because you don't have
to worry about banking in the $01FCxx vectors.  The $E10200 vector is
available whenever GS/OS is active, under System Software 5.0 or later.

THE DYN_SLOT_ARBITER AND SET_SYS_SPEED VECTORS

Two other GS/OS System Service vectors are duplicated in bank $E1:
SET_SYS_SPEED ($E10204) and DYN_SLOT_ARBITER ($E10208).  Like MOVE_INFO, these
are available when GS/OS is active under System Software 5.0 or later.


Further Reference
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   o   Apple IIgs GS/OS Device Driver Reference
   o   Apple IIgs Firmware Reference