dos33fsprogs/games/keen/gr_pageflip.s

	;==========
	; page_flip
	;==========

page_flip:
	lda	DRAW_PAGE
	eor	#4
	sta	DRAW_PAGE
	beq	page_flip_show_2	; if draw page now 0, disp page 2
page_flip_show_1:
        bit	PAGE1
	rts								; 6
page_flip_show_2:
	bit	PAGE2							; 4
	rts								; 6
keen1: initial mostly working proof 2024-03-10 05:44:20 +00:00			`;==========`
			`; page_flip`
			`;==========`

			`page_flip:`
keen: update status 2024-03-16 05:28:25 +00:00			`lda DRAW_PAGE`
			`eor #4`
			`sta DRAW_PAGE`
			`beq page_flip_show_2 ; if draw page now 0, disp page 2`
keen1: initial mostly working proof 2024-03-10 05:44:20 +00:00			`page_flip_show_1:`
keen: update status 2024-03-16 05:28:25 +00:00			`bit PAGE1`
			`rts ; 6`
			`page_flip_show_2:`
			`bit PAGE2 ; 4`
keen1: initial mostly working proof 2024-03-10 05:44:20 +00:00			`rts ; 6`