Hi there!
It's dead simple, but yet so common code that everybody
can make good use of this macro:
;-------------------------------------------------------
; VERTICAL_SYNC
; Original author: Manuel Polik
; Inserts the code required for a proper 3 scannline
; vertical sync sequence
;
; Note: Alters the accumulator
;
; IN:
; OUT: A = 1
MAC VERTICAL_SYNC
LDA #$02 ; A = VSYNC enable
STA WSYNC ; Finish current line
STA VSYNC ; Start vertical sync
STA WSYNC ; 1st line vertical sync
STA WSYNC ; 2nd line vertical sync
LSR ; A = VSYNC disable
STA WSYNC ; 3rd line vertical sync
STA VSYNC ; Stop vertical sync
ENDM
Greetings,
Manuel
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