Atari ST series - Page 229

Offgibit
Clear a Bit on Sound Chip I/O Port
Offgibit() Opcode = 29
A to m ically clears a sin g le bit of th e P o rt A I/O re giste r on th e PS G so u n d
chip .
C macro format
in t bitn u m ;
O ffgib it(b itn u m );
Machine language format
m o v e.w # b it n u m , — (sp )
m o v e.w # 2 9 , - (sp )
trap # 1 4
ad d q .l # 4 ,s p
Inputs
b itn u m w o rd T h e n u m b er of th e bit (0 -7 ) to ch a n g e .
Results
N o ne
See also
O n g ib it()
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