438 lines
8.8 KiB
ArmAsm
438 lines
8.8 KiB
ArmAsm
; C64 Opener
|
|
; all good demos start with the C64 boot screen, right?
|
|
|
|
; Apple II has a lot of trouble making clear text with bluish background
|
|
; it looks a lot cleaner in black+white
|
|
|
|
; Zero page addresses
|
|
|
|
c64_opener:
|
|
|
|
;===================
|
|
; init vars
|
|
;===================
|
|
lda #0
|
|
sta FRAME
|
|
sta FRAMEH
|
|
|
|
;===================
|
|
; setup graphics
|
|
;===================
|
|
|
|
; We assume that the c64 image was put in $2000 by the loader
|
|
|
|
;===================
|
|
; setup text
|
|
;===================
|
|
|
|
lda #8
|
|
sta DRAW_PAGE
|
|
|
|
lda #$A0 ; regular spaces
|
|
jsr clear_gr
|
|
|
|
lda #<apple2_text
|
|
sta OUTL
|
|
lda #>apple2_text
|
|
sta OUTH
|
|
|
|
jsr move_and_print
|
|
jsr move_and_print
|
|
jsr move_and_print
|
|
|
|
;==============================
|
|
; setup graphics for vapor lock
|
|
;==============================
|
|
|
|
jsr vapor_lock ; 6
|
|
|
|
bit PAGE0 ; first graphics page ; 4
|
|
bit FULLGR ; full screen graphics ; 4
|
|
bit HIRES ; hires mode !!! ; 4
|
|
bit SET_GR ; graphics mode ; 4
|
|
|
|
; vapor lock returns with us at beginning of hsync in line
|
|
; 114 (7410 cycles), so with 5070 + 4550 lines to go (9620)
|
|
; - 16 = 9604, -3 for jmp = 9601
|
|
|
|
; 5070+4550 = 9620
|
|
; -16
|
|
; -3
|
|
; +1 to get things aligned?
|
|
; -9298
|
|
; =======
|
|
; 304
|
|
|
|
jsr gr_copy_to_current ; 6+ 9292
|
|
|
|
; Try X=29 Y=2 cycles=303
|
|
|
|
; Try X=59 Y=1 cycles=302 R2
|
|
|
|
nop
|
|
|
|
ldy #1 ; 2
|
|
loopcoA:ldx #59 ; 2
|
|
loopcoB:dex ; 2
|
|
bne loopcoB ; 2nt/3
|
|
dey ; 2
|
|
bne loopcoA ; 2nt/3
|
|
|
|
beq c64_split
|
|
;.align $100
|
|
|
|
|
|
;================================================
|
|
; c64_split
|
|
;================================================
|
|
; We want to:
|
|
; Wait 3s, just flashing cursor@1Hz
|
|
; Then slowly open to text page0
|
|
|
|
|
|
c64_split:
|
|
c64_mixed:
|
|
jmp c64_kill_time ; 3
|
|
|
|
; Put smc here to jmp to kill_time until we hit state2?
|
|
|
|
; EA nop ; kill 6 cycles (room for rts) ; 2
|
|
; A2 08 ldx #8 ; width of opening in table ; 2
|
|
ldy #24 ; height? ; 2
|
|
|
|
c64_mixed_loop:
|
|
c64_smc2:
|
|
lda c64_multiples+17,x ; lookup split size ; 4 \
|
|
sta c64_smc+1 ; modify code ; 4 |
|
|
c64_smc: ; |-- 65
|
|
jsr tsplit_4 ; 6+46 |
|
|
dey ; 2 |
|
|
bne c64_mixed_loop ; 3 /
|
|
|
|
; -1
|
|
nop ; 2
|
|
ldy #24 ; 2
|
|
dex ; 2
|
|
bne c64_smc ; 3
|
|
|
|
; -1
|
|
|
|
; need to kill
|
|
; -6 from offset
|
|
; +1 fall through
|
|
; -9 from check
|
|
; +1 from other fallthrough
|
|
;================
|
|
; -13
|
|
|
|
c64_done_screen:
|
|
|
|
;======================================================
|
|
; We have 4550 cycles in the vblank, use them wisely
|
|
;======================================================
|
|
; do_nothing should be 4550
|
|
; -13 from screen drawing
|
|
; -10 keyboard handling
|
|
; -27 frameh adjustment
|
|
; -44 state2 handling
|
|
; -24 done_blinding
|
|
; -7 check if past time
|
|
; -46 cursor blink
|
|
; -1038 play music
|
|
;==================================
|
|
; = 3341
|
|
|
|
|
|
; run the 2Hz counter, overflow at 30 60Hz frames
|
|
clc ; 2
|
|
lda FRAME ; 3
|
|
adc #1 ; 2
|
|
sta FRAME ; 3
|
|
|
|
cmp #30 ; 2
|
|
bne not_thirty ; 3
|
|
;===========
|
|
; 15
|
|
thirty:
|
|
; -1
|
|
lda #0 ; 2
|
|
sta FRAME ; 3
|
|
inc FRAMEH ; 5
|
|
jmp done_thirty ; 3
|
|
;===========
|
|
; 12
|
|
|
|
not_thirty:
|
|
lda $0 ; nop ; 3
|
|
lda $0 ; nop ; 3
|
|
lda $0 ; nop ; 3
|
|
lda $0 ; nop ; 3
|
|
;===========
|
|
; 12
|
|
|
|
done_thirty:
|
|
|
|
|
|
c64_window_adjust:
|
|
|
|
;===========================
|
|
; If > 3.5s then patch SMC and move window
|
|
;===========================
|
|
; < 7 = 8+36 = 44
|
|
; > 7, not tick = 8+36=44
|
|
|
|
lda FRAMEH ; 3
|
|
cmp #7 ; 2
|
|
bcc c64_not_state2 ; 3
|
|
;============
|
|
; 8
|
|
|
|
; Update the code to not kill_time but do the split ; -1
|
|
lda #$EA ; 2
|
|
sta c64_mixed ; 4
|
|
lda #$A2 ; 2
|
|
sta c64_mixed+1 ; 4
|
|
lda #$08 ; 2
|
|
sta c64_mixed+2 ; 4
|
|
|
|
lda FRAME ; 3
|
|
and #$03 ; 2
|
|
bne blj ; 3
|
|
;===========
|
|
; 25
|
|
|
|
; -1
|
|
c64_smc3:
|
|
dec c64_smc2+1 ; 6
|
|
jmp blj_done ; 3
|
|
;============
|
|
; 8
|
|
blj:
|
|
nop
|
|
lda $0
|
|
lda $0
|
|
blj_done:
|
|
|
|
|
|
|
|
jmp c64_done_states ; 3
|
|
|
|
;===================
|
|
; 36
|
|
c64_not_state2:
|
|
inc $0 ; 5
|
|
dec $0 ; 5
|
|
inc $0 ; 5
|
|
dec $0 ; 5
|
|
inc $0 ; 5
|
|
dec $0 ; 5
|
|
lda $0 ; 3
|
|
lda $0 ; 3
|
|
|
|
|
|
|
|
c64_done_states:
|
|
|
|
;=======================
|
|
; see if done blinding
|
|
;=======================
|
|
;
|
|
|
|
lda FRAMEH ; 3
|
|
cmp #9 ; 2
|
|
bne c64_wait_blinding ; 3
|
|
;===========
|
|
; 8
|
|
|
|
; -1
|
|
lda #$ea ; 2
|
|
sta c64_smc3 ; 4
|
|
sta c64_smc3+1 ; 4
|
|
sta c64_smc3+2 ; 4
|
|
jmp c64_done_blinding ; 3
|
|
;===========
|
|
; 16
|
|
c64_wait_blinding:
|
|
lda $0
|
|
lda $0
|
|
lda $0
|
|
lda $0
|
|
nop
|
|
nop
|
|
|
|
c64_done_blinding:
|
|
|
|
|
|
;=======================
|
|
; see if done
|
|
;=======================
|
|
|
|
lda FRAMEH ; 3
|
|
cmp #22 ; 2
|
|
beq done_c64 ; 3
|
|
; -1
|
|
;============
|
|
; 7
|
|
|
|
c64_blink_cursor:
|
|
; handle the cursor
|
|
; FIXME: not aligned well. Do we care?
|
|
|
|
lda FRAMEH ; 3
|
|
and #$1 ; 2
|
|
beq cursor_off ; 3
|
|
;============
|
|
; 8
|
|
cursor_on:
|
|
; -1
|
|
; it's lSB first
|
|
; blue is 6
|
|
; 1 1111110
|
|
lda #$fE ; blue ; 2
|
|
sta $3300 ; 52 ; 4
|
|
sta $3B00 ; 54 ; 4
|
|
sta $2380 ; 56 ; 4
|
|
sta $2B80 ; 58 ; 4
|
|
; purple is 2
|
|
; 0 1111110
|
|
lda #$7E ; purple ; 2
|
|
sta $3700 ; 53 ; 4
|
|
sta $3F00 ; 55 ; 4
|
|
sta $2780 ; 57 ; 4
|
|
sta $2F80 ; 59 ; 4
|
|
|
|
jmp cursor_done ; 3
|
|
;============
|
|
; 38
|
|
cursor_off:
|
|
; blue is 6
|
|
; 1 1010101
|
|
lda #$d5 ; blue ; 2
|
|
sta $3300 ; 52 ; 4
|
|
sta $3B00 ; 54 ; 4
|
|
sta $2380 ; 56 ; 4
|
|
sta $2B80 ; 58 ; 4
|
|
; purple is 2
|
|
; 0 1010101
|
|
lda #$55 ; purple ; 2
|
|
sta $3700 ; 53 ; 4
|
|
sta $3F00 ; 55 ; 4
|
|
sta $2780 ; 57 ; 4
|
|
sta $2F80 ; 59 ; 4
|
|
nop ; 2
|
|
;============
|
|
; 38
|
|
|
|
cursor_done:
|
|
|
|
jsr play_music ; 6+1032
|
|
|
|
; Try X=110 Y=6 cycles=3337 R4
|
|
|
|
nop
|
|
nop
|
|
|
|
ldy #6 ; 2
|
|
loopcoE:ldx #110 ; 2
|
|
loopcoF:dex ; 2
|
|
bne loopcoF ; 2nt/3
|
|
dey ; 2
|
|
bne loopcoE ; 2nt/3
|
|
|
|
lda KEYPRESS ; 4
|
|
bpl no_c64_keypress ; 3
|
|
jmp done_c64
|
|
no_c64_keypress:
|
|
|
|
jmp c64_split ; 3
|
|
|
|
done_c64:
|
|
bit KEYRESET
|
|
;jsr mockingboard_mute
|
|
cli
|
|
rts ; 6
|
|
|
|
|
|
|
|
|
|
;===================
|
|
; c64 graphic, load at $2000-$4000 to start with
|
|
;===================
|
|
;c64:
|
|
;.incbin "c64.img"
|
|
;c64_end:
|
|
|
|
|
|
;=========================================================
|
|
; DdBbbNnNnNnNnNnNnNnNnNnNn NnNnNnNnNnNnNnNnNnNnNnNnNnNnNnNnNnNnNnNn Nothing
|
|
; DdBbbNnNnNnNnNnNnNnNnNnNn NnNnNnNnNnNnNnNnTtttGgggNnNnNnNnNnNnNnNn 16= 4W
|
|
; DdBbbNnNnNnNnNnNnNnNnNnLl lNnNnNnNnNnNnNnTtttNnGgggNnNnNnNnNnNnLll 15= 6W
|
|
; DdBbbNnNnNnNnNnNnNnNnNnNn NnNnNnNnNnNnNnTtttNnNnGgggNnNnNnNnNnNnNn 14= 8W
|
|
; DdBbbNnNnNnNnNnNnNnNnNnLl lNnNnNnNnNnNnTtttNnNnNnGgggNnNnNnNnNnLll 13=10W
|
|
; DdBbbNnNnNnNnNnNnNnNnNnNn NnNnNnNnNnNnTtttNnNnNnNnGgggNnNnNnNnNnNn 12=12W
|
|
; DdBbbNnNnNnNnNnNnNnNnNnLl lNnNnNnNnNnTtttNnNnNnNnNnGgggNnNnNnNnLll 11=14W
|
|
; DdBbbNnNnNnNnNnNnNnNnNnNn NnNnNnNnNnTtttNnNnNnNnNnNnGgggNnNnNnNnNn 10=16W
|
|
; DdBbbNnNnNnNnNnNnNnNnNnLl lNnNnNnNnTtttNnNnNnNnNnNnNnGgggNnNnNnLll 9=18W
|
|
; DdBbbNnNnNnNnNnNnNnNnNnNn NnNnNnNnTtttNnNnNnNnNnNnNnNnGgggNnNnNnNn 8=20W
|
|
; DdBbbNnNnNnNnNnNnNnNnNnLl lNnNnNnTtttNnNnNnNnNnNnNnNnNnGgggNnNnLll 7=22W
|
|
; DdBbbNnNnNnNnNnNnNnNnNnNn NnNnNnTtttNnNnNnNnNnNnNnNnNnNnGgggNnNnNn 6=24W
|
|
; DdBbbNnNnNnNnNnNnNnNnNnLl lNnNnTtttNnNnNnNnNnNnNnNnNnNnNnGgggNnLll 5=26W
|
|
; DdBbbNnNnNnNnNnNnNnNnNnNn NnNnTtttNnNnNnNnNnNnNnNnNnNnNnNnGgggNnNn 4=28W
|
|
; DdBbbNnNnNnNnNnNnNnNnNnLl lNnTtttNnNnNnNnNnNnNnNnNnNnNnNnNnGgggLll 3=30W
|
|
; DdBbbNnNnNnNnNnNnNnNnNnNn NnTtttNnNnNnNnNnNnNnNnNnNnNnNnNnNnGgggNn 2=32W
|
|
|
|
; nLllDdBbbNnNnNnNnNnNnLllN nTtttNnNnNnNnNnNnNnNnNnNnNnNnNnNnNnGgggN NOPE
|
|
; DdBbbNnNnNnNnNnNnNnNnNnNn TtttNnNnNnNnNnNnNnNnNnNnNnNnNnNnNnNnGggg 0=36W
|
|
|
|
|
|
|
|
;===========================================
|
|
; c64_kill_time
|
|
;===========================================
|
|
; do nothing but blink cursor
|
|
; 192 * 65 = 12480 cycles
|
|
; - 3 jsr in
|
|
; -3 jmp back
|
|
; +13 to match split
|
|
; ========
|
|
; 12487
|
|
c64_kill_time:
|
|
|
|
; Try X=165 Y=15 cycles=12466 R8
|
|
|
|
; Try X=33 Y=73 cycles=12484 R3
|
|
|
|
lda $0
|
|
|
|
ldy #73 ; 2
|
|
loopc6a:ldx #33 ; 2
|
|
loopc6b:dex ; 2
|
|
bne loopc6b ; 2nt/3
|
|
dey ; 2
|
|
bne loopc6a ; 2nt/3
|
|
|
|
|
|
jmp c64_done_screen ; 3
|
|
|
|
|
|
;.align $100
|
|
|
|
|
|
apple2_text:
|
|
.byte 16,0
|
|
.asciiz "APPLE ]["
|
|
.byte 4,20
|
|
.asciiz "NONE OF THIS SHOULD BE POSSIBLE,"
|
|
.byte 5,21
|
|
.asciiz "RACING THE BEAM TO THE EXTREME"
|
|
|
|
; NOTE: Needs to start at least 15 bytes into the page
|
|
c64_multiples:
|
|
.byte 184,184
|
|
.byte 184,184,184,184,184,184,184,184
|
|
.byte 161,138,115, 92, 69 ,46,23, 0
|
|
.byte 0,0,0,0,0,0,0,0
|
|
; end is c64_multiples+24
|
|
|
|
|