lemm: split screen intro on IIe

games/lemm/hardware.inc

@@ -8,6 +8,7 @@ CLR80COL	=	$C000	; PAGE0/PAGE1 normal
 SET80COL	=	$C001	; PAGE0/PAGE1 switches PAGE0 in Aux instead
 EIGHTYCOLOFF	=	$C00C
 EIGHTYCOLON	=	$C00D
+VBLANK		=	$C019	; IIe *not* RDVBL (VBL signal low)
 TBCOLOR		=	$C022	; IIgs text foreground / background colors
 NEWVIDEO	=	$C029	; IIgs graphics modes
 SPEAKER		=	$C030

games/lemm/intro_level1.s

@@ -5,6 +5,16 @@
 
 intro_level1:
 
+	lda	#<level1_preview_lzsa
+	sta	getsrc_smc+1    ; LZSA_SRC_LO
+	lda	#>level1_preview_lzsa
+	sta	getsrc_smc+2    ; LZSA_SRC_HI
+
+	lda	#$20
+
+	jsr	decompress_lzsa2_fast
+
+
 	; clear text screen
 
 	jsr	clear_all
@@ -30,6 +40,15 @@ text_loop:
 	dex
 	bne	text_loop
 
+	bit	KEYRESET
+
+	lda	APPLEII_MODEL
+	cmp	#'E'
+	bne	intro_not_iie
+
+	jmp	split_screen_iie
+
+intro_not_iie:
 	; wait until keypress
 
 	jsr	wait_until_keypress
@@ -39,18 +58,85 @@ text_loop:
 level1_intro_text:
 .byte  0, 8,"LEVEL 1",0
 .byte 15, 8,"JUST DIG!",0
-.byte  9,13,"NUMBER OF LEMMINGS 10",0
-.byte 12,15,"10%  TO BE SAVED",0
-.byte 12,17,"RELEASE RATE 50",0
-.byte 13,19,"TIME 5 MINUTES",0
-.byte 15,21,"RATING FUN",0
+.byte  9,12,"NUMBER OF LEMMINGS 10",0
+.byte 12,14,"10%  TO BE SAVED",0
+.byte 12,16,"RELEASE RATE 50",0
+.byte 13,18,"TIME 5 MINUTES",0
+.byte 15,20,"RATING FUN",0
 .byte  8,23,"PRESS RETURN TO CONINUE",0
 
 .byte  0, 8,"LEVEL 5",0
 .byte 15, 8,"YOU NEED BASHERS THIS TIME",0
-.byte  9,13,"NUMBER OF LEMMINGS 50",0
-.byte 12,15,"10%  TO BE SAVED",0
-.byte 12,17,"RELEASE RATE 50",0
-.byte 13,19,"TIME 5 MINUTES",0
-.byte 15,21,"RATING FUN",0
+.byte  9,12,"NUMBER OF LEMMINGS 50",0
+.byte 12,14,"10%  TO BE SAVED",0
+.byte 12,16,"RELEASE RATE 50",0
+.byte 13,18,"TIME 5 MINUTES",0
+.byte 15,20,"RATING FUN",0
 .byte  8,23,"PRESS RETURN TO CONINUE",0
+
+
+
+.align $100
+
+; split screen?
+
+split_screen_iie:
+
+	; wait for vblank on IIe
+	; positive? during vblank
+
+wait_vblank_iie:
+	lda	VBLANK
+	bmi	wait_vblank_iie		; wait for positive (in vblank)
+wait_vblank_done_iie:
+	lda	VBLANK			; wait for negative (vlank done)
+	bpl	wait_vblank_done_iie
+
+	;
+split_loop:
+	;===========================
+	; hires for 64 lines
+	;	each line 65 cycles (25 hblank+40 bytes)
+
+	bit	HIRES		; 4
+	bit	SET_GR		; 4
+
+	; (64*65)-8 = 4160-8 = 4152
+
+	; Try X=91 Y=9 cycles=4150
+
+	nop	; delay two more
+
+	ldy	#9							; 2
+loop1:	ldx	#91							; 2
+loop2:	dex								; 2
+	bne	loop2							; 2nt/3
+	dey								; 2
+	bne	loop1							; 2nt/3
+
+	; text for 128 lines + horizontal blank
+	; vblank = 4550 cycles
+
+	; (128*65)+4550-15 = 8320+4550-15 = 12855
+
+	bit	LORES		; 4
+	bit	SET_TEXT	; 4
+
+	; Try X=150 Y=17 cycles=12853
+
+	nop		; 2
+
+	ldy	#17							; 2
+loop3:	ldx	#150							; 2
+loop4:	dex								; 2
+	bne	loop4							; 2nt/3
+	dey								; 2
+	bne	loop3							; 2nt/3
+
+	lda	KEYPRESS	; 4
+	bpl	split_loop	; 2nt/3t
+
+
+	rts
+
+