Atari ST series - Page 252

Cprnout
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Cprnout()
Opcode = 5 ($05)
T his fu nctio n s e n d s a sin gle ch a r a cte r to th e C e n tron ics p arallel p rin te r d e 
v ice. It d o es n o t retu rn un til th e ch ara cter h as b e en se n t, o r th e p rin ter
tim es ou t.
C macro format
ch a r ch ;
in t sta tu s;
statu s = C p rn o u t(ch );
Machine language format
m o v e .w # c h , - (sp )
m o v e.w # 5 , - ( s p )
trap # 1
a d d q .l # 4 ,s p
Inputs
ch
w o rd
T h e low b y te co n tain s th e A SC II v a lu e of
th e ch a ra cte r to w rite to th e p rin te r p o rt,
th e h ig h b yte is 0.
Results
sta tu s
w o rd
A v alu e o f - 1 is re tu rn ed if th e c h ara cte r
h as b ee n se n t co rrectly , a 0 if th e ch a ra c
te r c a n 't be s en t w ith in th e time out p e 
rio d (tim e o u t pe rio d refers to th e co n d i
tion w h en th e p ap er ru n s o u t, th e p rin ter
is offline, a n d so on ).
See also
C p m o s (), C p m o u t (), C c o n o u t ()
n e w p ag e
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