mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-17 14:12:58 +00:00
453 lines
7.6 KiB
ArmAsm
453 lines
7.6 KiB
ArmAsm
; Display a 40x96 lo-res image
|
|
|
|
; by deater (Vince Weaver) <vince@deater.net>
|
|
|
|
|
|
appleII_intro:
|
|
|
|
;===================
|
|
; init screen
|
|
; jsr TEXT
|
|
; jsr HOME
|
|
; bit KEYRESET
|
|
|
|
;===================
|
|
; init vars
|
|
|
|
lda #0
|
|
sta DRAW_PAGE
|
|
sta DUDE_X
|
|
sta FOREVER_OFFSET
|
|
|
|
;=============================
|
|
; 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
|
|
lda #$10
|
|
jsr load_rle_gr
|
|
|
|
; GR part
|
|
bit PAGE0
|
|
|
|
; jsr wait_until_keypressed
|
|
|
|
|
|
;==============================
|
|
; setup graphics for vapor lock
|
|
;==============================
|
|
|
|
jsr vapor_lock ; 6+
|
|
|
|
; vapor lock returns with us at beginning of hsync in line
|
|
; 114 (7410 cycles), so with 5070 lines to go to vblank
|
|
|
|
; 5070+17030+4550=26650
|
|
|
|
; GR part
|
|
bit LORES ; 4
|
|
bit SET_GR ; 4
|
|
bit FULLGR ; 4
|
|
|
|
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
|
|
|
|
; 26650
|
|
; -12 GR init
|
|
; -5465 clear page0
|
|
; -5465 clear page1
|
|
;==========
|
|
; 15708
|
|
|
|
; Try X=29 Y=104 cycles=15705R3
|
|
|
|
lda TEMP
|
|
|
|
ldy #104 ; 2
|
|
loopA: ldx #29 ; 2
|
|
loopB: dex ; 2
|
|
bne loopB ; 2nt/3
|
|
dey ; 2
|
|
bne loopA ; 2nt/3
|
|
|
|
; jmp display_loop ; 3
|
|
|
|
;.align $100
|
|
|
|
|
|
;================================================
|
|
; 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
|
|
ldx #25 ; 130 cycles with PAGE0 ; 2
|
|
page0_loop: ; delay 126+bit
|
|
dex ; 2
|
|
bne page0_loop ; 2/3
|
|
|
|
|
|
bit PAGE0 ; 4
|
|
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
|
|
;======================================================
|
|
; do_nothing should be:
|
|
; 4550
|
|
; +1 (fallthrough)
|
|
; -2 initial conditions
|
|
; -1174
|
|
; -7 (keypress)
|
|
; -3 (jump)
|
|
; -1243 (play_music)
|
|
; =====
|
|
; 2122 2179
|
|
|
|
jsr do_nothing ; 6
|
|
|
|
;========================
|
|
; Add 8 to wipe_right
|
|
; Add 12 to wipe_left
|
|
; Add 16 to forever
|
|
; Add 15 to donothing
|
|
|
|
ldx DUDE_X ; 3
|
|
cpx #40 ; 2
|
|
bcc wipe_right ; blt ; 3
|
|
; -1
|
|
cpx #80 ; 2
|
|
bcc wipe_left ; blt ; 3
|
|
; -1
|
|
cpx #192 ; 2
|
|
bcc forever ; blt ; 3
|
|
; -1
|
|
|
|
;=========================
|
|
; hold steady
|
|
|
|
done_done:
|
|
; -1
|
|
;===========================
|
|
; delay 1174-15-3=1156
|
|
|
|
; delay
|
|
|
|
; Try X=45 Y=5 cycles=1156
|
|
|
|
ldy #5 ; 2
|
|
loop11: ldx #45 ; 2
|
|
loop21: dex ; 2
|
|
bne loop21 ; 2nt/3
|
|
dey ; 2
|
|
bne loop11 ; 2nt/3
|
|
|
|
|
|
jmp intro_wipe_done ; 3
|
|
|
|
|
|
|
|
;=====================
|
|
;=====================
|
|
; wipe right
|
|
;=====================
|
|
;=====================
|
|
; 24*(30+18)-1 +5+3 = 1159
|
|
; 1174-1159-8=7
|
|
|
|
; page0 -- copy from $c00
|
|
wipe_right:
|
|
nop ; 2
|
|
nop ; 2
|
|
lda WASTE_CYCLES ; 3
|
|
;=====
|
|
; 7
|
|
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
|
|
adc #$8 ; 2
|
|
sta page0_load_smc+2 ; 4
|
|
;=====
|
|
; 30
|
|
|
|
page0_load_smc:
|
|
lda $1000,X ; 4+
|
|
page0_store_smc:
|
|
sta $1000,X ; 5
|
|
|
|
iny ; 2
|
|
iny ; 2
|
|
cpy #48 ; 2
|
|
bne page0_loopy ; 3
|
|
;================
|
|
; 18
|
|
|
|
; -1
|
|
inc DUDE_X ; 5
|
|
jmp intro_wipe_done ; 3
|
|
|
|
;=====================
|
|
;=====================
|
|
; 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 $1000,X ; 5
|
|
|
|
iny ; 2
|
|
iny ; 2
|
|
cpy #48 ; 2
|
|
bne page1_loopy ; 3
|
|
;================
|
|
; 18
|
|
|
|
; -1
|
|
inc DUDE_X ; 5
|
|
jmp intro_wipe_done ; 3
|
|
|
|
|
|
;=========================
|
|
; FOREVER
|
|
;==========================
|
|
; F@80, 11,32
|
|
; O@96
|
|
; R@112
|
|
; E@128
|
|
; V@144
|
|
; E@160
|
|
; R@176
|
|
|
|
forever:
|
|
; -1
|
|
;===========================
|
|
; forever:
|
|
; 1174 base
|
|
; -16 previous if/else
|
|
; -7 check
|
|
; -18 new_forever
|
|
; -38 colors
|
|
; -14 putchar prep
|
|
; -365 putchar
|
|
; -8 end
|
|
;=====================
|
|
; 708
|
|
|
|
txa ; 2
|
|
and #$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
|
|
|
|
|
|
|
|
|
|
|
|
;==========================
|
|
;==========================
|
|
intro_wipe_done:
|
|
lda FRAME_PLAY_PAGE ; 3
|
|
cmp #2 ; 2
|
|
beq appleii_done ; 3
|
|
; -1
|
|
|
|
; lda KEYPRESS ; 4
|
|
; bpl no_keypress2 ; 3
|
|
; jmp appleii_done
|
|
no_keypress2:
|
|
|
|
|
|
jsr play_frame_compressed ; 6+1237
|
|
|
|
jmp display_loop ; 3
|
|
|
|
appleii_done:
|
|
rts
|
|
|
|
;.align $100
|
|
|
|
;=================================
|
|
; do nothing
|
|
;=================================
|
|
; and take 2122-12 = 2110 cycles to do it
|
|
do_nothing:
|
|
; Try X=21 Y=19 cycles=2110
|
|
|
|
ldy #19 ; 2
|
|
loop1: ldx #21 ; 2
|
|
loop2: dex ; 2
|
|
bne loop2 ; 2nt/3
|
|
dey ; 2
|
|
bne loop1 ; 2nt/3
|
|
|
|
rts ; 6
|
|
do_nothing_end:
|
|
|
|
forever_string:
|
|
.byte ' ','F','O','R','E','V','E','R'
|
|
|
|
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
|
|
|
|
|
|
.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
|
|
|
|
.assert >do_nothing = >do_nothing_end, error, "do_nothing crosses page"
|
|
|
|
|