dos33fsprogs/demosplash2019/appleII_intro.s

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; Display a 40x96 lo-res image
; by deater (Vince Weaver) <vince@deater.net>
appleII_intro:
;===================
; init screen
; jsr TEXT
; jsr HOME
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; bit KEYRESET
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;===================
; init vars
lda #0
sta DRAW_PAGE
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sta DUDE_X
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sta FOREVER_OFFSET
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;=============================
; Load graphic page0
lda #<appleII_low
sta GBASL
lda #>appleII_low
sta GBASH
lda #$c
jsr load_rle_gr
;=============================
; Load graphic page1
lda #<appleII_high
sta GBASL
lda #>appleII_high
sta GBASH
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lda #$10
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jsr load_rle_gr
; GR part
bit PAGE0
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; jsr wait_until_keypressed
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;==============================
; setup graphics for vapor lock
;==============================
jsr vapor_lock ; 6+
; vapor lock returns with us at beginning of hsync in line
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; 114 (7410 cycles), so with 5070 lines to go to vblank
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; 5070+17030+4550=26650
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; GR part
bit LORES ; 4
bit SET_GR ; 4
bit FULLGR ; 4
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lda #0 ; 2
sta DRAW_PAGE ; 3
jsr gr_clear_all ; 6+ 5454
lda #4 ; 2
sta DRAW_PAGE ; 3
jsr gr_clear_all ; 6+ 5454
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; 26650
; -12 GR init
; -5465 clear page0
; -5465 clear page1
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;==========
; 15708
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; Try X=29 Y=104 cycles=15705R3
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lda TEMP
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ldy #104 ; 2
loopA: ldx #29 ; 2
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loopB: dex ; 2
bne loopB ; 2nt/3
dey ; 2
bne loopA ; 2nt/3
; jmp display_loop ; 3
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;.align $100
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;================================================
; Display Loop
;================================================
; each scan line 65 cycles
; 1 cycle each byte (40cycles) + 25 for horizontal
; Total of 12480 cycles to draw screen
; Vertical blank = 4550 cycles (70 scan lines)
; Total of 17030 cycles to get back to where was
; We want to alternate between page1 and page2 every 65 cycles
; vblank = 4550 cycles to do scrolling
; 2 + 48*( (4+2+25*(2+3)) + (4+2+23*(2+3)+4+5)) + 9)
; 48*[(6+125)-1] + [(6+115+10)-1]
display_loop:
ldy #48 ; 2
outer_loop:
bit PAGE1 ; 4
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ldx #25 ; 130 cycles with PAGE0 ; 2
page0_loop: ; delay 126+bit
dex ; 2
bne page0_loop ; 2/3
bit PAGE0 ; 4
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ldx #23 ; 130 cycles with PAGE1 ; 2
page1_loop: ; delay 115+(7 loop)+4 (bit)+4(extra)
dex ; 2
bne page1_loop ; 2/3
nop ; 2
lda DRAW_PAGE ; 3
dey ; 2
bne outer_loop ; 2/3
;======================================================
; We have 4550 cycles in the vblank, use them wisely
;======================================================
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; do_nothing should be:
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; 4550
; +1 (fallthrough)
; -2 initial conditions
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; -1174
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; -7 (keypress)
; -3 (jump)
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; -1243 (play_music)
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; =====
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; 2122 2179
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jsr do_nothing ; 6
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;========================
; Add 8 to wipe_right
; Add 12 to wipe_left
; Add 16 to forever
; Add 15 to donothing
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ldx DUDE_X ; 3
cpx #40 ; 2
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bcc wipe_right ; blt ; 3
; -1
cpx #80 ; 2
bcc wipe_left ; blt ; 3
; -1
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cpx #192 ; 2
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bcc forever ; blt ; 3
; -1
;=========================
; hold steady
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done_done:
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; -1
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;===========================
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; delay 1174-15-3=1156
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; delay
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; Try X=45 Y=5 cycles=1156
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ldy #5 ; 2
loop11: ldx #45 ; 2
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loop21: dex ; 2
bne loop21 ; 2nt/3
dey ; 2
bne loop11 ; 2nt/3
jmp intro_wipe_done ; 3
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;=====================
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;=====================
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; wipe right
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;=====================
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;=====================
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; 24*(30+18)-1 +5+3 = 1159
; 1174-1159-8=7
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; page0 -- copy from $c00
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wipe_right:
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nop ; 2
nop ; 2
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lda WASTE_CYCLES ; 3
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;=====
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; 7
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page0_loopy:
lda gr_offsets,Y ; 4+
sta page0_store_smc+1 ; 4
sta page0_load_smc+1 ; 4
lda gr_offsets+1,Y ; 4+
clc ; 2
adc #$4 ; 2
sta page0_store_smc+2 ; 4
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adc #$8 ; 2
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sta page0_load_smc+2 ; 4
;=====
; 30
page0_load_smc:
lda $1000,X ; 4+
page0_store_smc:
sta $1000,X ; 5
iny ; 2
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iny ; 2
cpy #48 ; 2
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bne page0_loopy ; 3
;================
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; 18
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; -1
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inc DUDE_X ; 5
jmp intro_wipe_done ; 3
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;=====================
;=====================
; wipe left
;=====================
;=====================
; 11+ 24*(28+18)-1 +5+3 = 1170
; 1174-1122-12=40
; page0 -- copy from $c00
wipe_left:
inc WASTE_CYCLES ; 5
inc WASTE_CYCLES ; 5
inc WASTE_CYCLES ; 5
inc WASTE_CYCLES ; 5
inc WASTE_CYCLES ; 5
inc WASTE_CYCLES ; 5
inc WASTE_CYCLES ; 5
inc WASTE_CYCLES ; 5
; 40 -> 79 map to 39->0 = 39 - (X-40) = 79-X
lda #79 ; 2
sec ; 2
sbc DUDE_X ; 3
tax ; 2
ldy #0 ; 2
;=====
; 11
page1_loopy:
lda gr_offsets,Y ; 4+
sta page1_store_smc+1 ; 4
sta page1_load_smc+1 ; 4
lda gr_offsets+1,Y ; 4+
clc ; 2
sta page1_store_smc+2 ; 4
adc #$8 ; 2
sta page1_load_smc+2 ; 4
;=====
; 28
page1_load_smc:
lda $1000,X ; 4+
page1_store_smc:
sta $1000,X ; 5
iny ; 2
iny ; 2
cpy #48 ; 2
bne page1_loopy ; 3
;================
; 18
; -1
inc DUDE_X ; 5
jmp intro_wipe_done ; 3
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;=========================
; FOREVER
;==========================
; F@80, 11,32
; O@96
; R@112
; E@128
; V@144
; E@160
; R@176
forever:
; -1
;===========================
; forever:
; 1174 base
; -16 previous if/else
; -7 check
; -18 new_forever
; -38 colors
; -14 putchar prep
; -365 putchar
; -8 end
;=====================
; 708
txa ; 2
and #$f ; 2
beq new_forever ; 3
; -1
nop ; 2
nop ; 2
nop ; 2
nop ; 2
nop ; 2
nop ; 2
nop ; 2
nop ; 2
jmp write_forever ; 3
new_forever:
inc forever_string_smc+1 ; 6
lda forever_x_smc+1 ; 4
clc ; 2
adc #4 ; 2
sta forever_x_smc+1 ; 4
;=======
; 18
write_forever:
txa ; 2
and #$0c ; 2
tax ; 2
lda colors_first,X ; 4+
sta colors_hi ; 4
lda colors_first+1,X ; 4+
sta colors_hi+1 ; 4
lda colors_first+2,X ; 4+
sta colors_hi+2 ; 4
lda colors_first+3,X ; 4+
sta colors_hi+3 ; 4
;======
; 38
; Colors
; 0 0 0 4
; 0 0 4 C
; 0 4 C F
forever_string_smc:
lda forever_string ; 4+
forever_x_smc:
ldx #7 ; 2
ldy #32 ; 2
jsr put_char ; 6+365
;=======
; delay
; Try X=19 Y=7 cycles=708
ldy #7 ; 2
loop19: ldx #19 ; 2
loop29: dex ; 2
bne loop29 ; 2nt/3
dey ; 2
bne loop19 ; 2nt/3
inc DUDE_X ; 5
jmp intro_wipe_done ; 3
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;==========================
;==========================
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intro_wipe_done:
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lda FRAME_PLAY_PAGE ; 3
cmp #2 ; 2
beq appleii_done ; 3
; -1
; lda KEYPRESS ; 4
; bpl no_keypress2 ; 3
; jmp appleii_done
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no_keypress2:
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jsr play_frame_compressed ; 6+1237
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jmp display_loop ; 3
appleii_done:
rts
;.align $100
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;=================================
; do nothing
;=================================
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; and take 2122-12 = 2110 cycles to do it
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do_nothing:
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; Try X=21 Y=19 cycles=2110
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ldy #19 ; 2
loop1: ldx #21 ; 2
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loop2: dex ; 2
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bne loop2 ; 2nt/3
dey ; 2
bne loop1 ; 2nt/3
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rts ; 6
do_nothing_end:
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forever_string:
.byte ' ','F','O','R','E','V','E','R'
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colors_first: .byte $00,$00,$00,$00
colors_second: .byte $00,$04,$40,$00
colors_third: .byte $40,$4C,$C4,$04
colors_fourth: .byte $C4,$CF,$FC,$4C
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.if 0
colors_first: .byte $00,$00,$00,$00
colors_second: .byte $00,$40,$04,$00
colors_third: .byte $04,$C4,$4C,$40
colors_fourth: .byte $4C,$FC,$CF,$C4
.endif
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.assert >do_nothing = >do_nothing_end, error, "do_nothing crosses page"