Apple II
Technical Notes
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                                                  Developer Technical Support
Apple IIgs
#106: ADB Addendum

Written by: Dave Lyons                                              May 1992

This Technical Note documents some bits in the ADB SendInfo data byte for
setModes and clearModes.
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SendInfo is documented in Volume 1 of Apple IIgs Toolbox Reference, but it
doesn't tell you what any of the bits in the setModes/clearModes data byte are
for.  Well, here are the useful ones:


    Bit  Value  Description
    ---  -----  -------------------------------
     6    $40    Shift+CapsLock=Lowercase mode
     4    $10    Keyboard buffering
     3    $08    Dual-speed keys
     2    $04    Fast space/delete keys


For example, to turn off keyboard buffering without altering the user's
Battery RAM, you can do the following:

             pea 1                   ;number of data bytes
             pushlong #modesToClear  ;pointer to data byte
             pea 5                   ;modeCmd = clearModes
             _SendInfo
             ...

modesToClear dc.b $10                ;bit 4 = keyboard buffering


Note that the user's control panel setting will become current again if they
hit Command-Ctrl-Esc (the system calls the TOBRAMSETUP vector at $E10094 to
update the system from Battery RAM).


Further Reference
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   o   Apple IIgs Toolbox Reference, Volume 1