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implement waitvsync for plus4/c16

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This commit is contained in:
mrdudz 2017-07-17 23:55:18 +02:00
parent 33791c6efd
commit fe850fece8
2 changed files with 13 additions and 1 deletions
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2
include/cbm.h
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@ -153,7 +153,7 @@ struct cbm_dirent {
unsigned char get_tv (void);
/* Return the video mode the machine is using. */
#if !defined(__PLUS4__) && !defined(__C16__) && !defined(__CBM610__) && !defined(__PET__)
#if !defined(__CBM610__) && !defined(__PET__)
void waitvsync (void);
/* wait for the start of the next frame */
#endif

12
libsrc/plus4/waitvsync.s Normal file
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@ -0,0 +1,12 @@
.export _waitvsync
.include "plus4.inc"
_waitvsync:
@l1:
lda TED_VLINEHI
and #$01
ora TED_VLINELO
bne @l1
rts