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Wait macro for C64

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Pecusx
2023-05-09 14:43:18 +02:00
parent 5693fffd8a
commit 0385423fb0
2 changed files with 12 additions and 3 deletions
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C64/lib/MACRO.ASM
+12 -3
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@@ -278,9 +278,18 @@ upstartEnd
tay
.endm
;-------------------------------------
.macro wait
nop
.endm
.MACRO WAIT
; WAIT
; waits one frame (1/50 s(PAL) or 1/60s(NTSC))
?ze LDA $D012
cmp #16 ; if line<16 then wait for line>15 (long VBI protection)
bcc ?ze
sbc #10 ; last lines correction
?wa cmp $D012
bcc ?wa
?wf cmp $D012
bcs ?wf
.ENDM
;-------------------------------------
.macro halt
?s jmp ?s