2018-09-17 04:11:35 +00:00
|
|
|
; 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
|
|
|
|
; would be a lot clearer if I used black and white
|
|
|
|
|
2018-09-23 03:07:59 +00:00
|
|
|
TOP = $F0
|
|
|
|
BOTTOM = $F1
|
|
|
|
|
2018-09-17 04:12:51 +00:00
|
|
|
c64_opener:
|
2018-09-23 03:07:59 +00:00
|
|
|
;===================
|
|
|
|
; init vars
|
|
|
|
;===================
|
|
|
|
lda #0
|
|
|
|
sta TOP
|
|
|
|
sta BOTTOM
|
2018-09-17 04:12:51 +00:00
|
|
|
|
2018-09-17 04:11:35 +00:00
|
|
|
;===================
|
|
|
|
; set graphics mode
|
|
|
|
;===================
|
|
|
|
|
|
|
|
bit PAGE0 ; first graphics page
|
|
|
|
bit FULLGR ; full screen graphics
|
|
|
|
bit HIRES ; hires mode !!!
|
|
|
|
bit SET_GR ; graphics mode
|
|
|
|
|
|
|
|
lda #<c64
|
|
|
|
sta LZ4_SRC
|
|
|
|
lda #>c64
|
|
|
|
sta LZ4_SRC+1
|
|
|
|
|
|
|
|
lda #<c64_end
|
|
|
|
sta LZ4_END
|
|
|
|
lda #>c64_end
|
|
|
|
sta LZ4_END+1
|
|
|
|
|
|
|
|
|
|
|
|
lda #<$2000
|
|
|
|
sta LZ4_DST
|
|
|
|
lda #>$2000
|
|
|
|
sta LZ4_DST+1
|
|
|
|
|
|
|
|
jsr lz4_decode
|
|
|
|
|
|
|
|
|
2018-09-23 03:07:59 +00:00
|
|
|
jsr wait_until_keypress
|
|
|
|
|
|
|
|
|
|
|
|
;==============================
|
|
|
|
; 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
|
|
|
|
|
|
|
|
; Try X=57 Y=33 cycles=9604
|
|
|
|
|
|
|
|
ldy #33 ; 2
|
|
|
|
loopcoA:ldx #57 ; 2
|
|
|
|
loopcoB:dex ; 2
|
|
|
|
bne loopcoB ; 2nt/3
|
|
|
|
dey ; 2
|
|
|
|
bne loopcoA ; 2nt/3
|
|
|
|
|
|
|
|
jmp c64_split
|
|
|
|
.align $100
|
|
|
|
|
|
|
|
|
|
|
|
;================================================
|
|
|
|
; c64_split
|
|
|
|
;================================================
|
|
|
|
; We want to:
|
|
|
|
; Wait 3s, just flashing cursor@1Hz
|
|
|
|
; Then slowly open to text page0
|
|
|
|
; Count to 480?
|
|
|
|
; Width = 0 - 40, 10 steps
|
|
|
|
|
|
|
|
c64_split:
|
|
|
|
|
2018-09-23 17:44:03 +00:00
|
|
|
; curtain open
|
|
|
|
; 0 = delay 65
|
|
|
|
; 1 = delay 25+18, 4 open, 18
|
|
|
|
; 2 = delay 25+16, 8 open, 16
|
|
|
|
; 3 = delay 25+14, 12 open, 14
|
|
|
|
; 3 = delay 25+12, 16 open, 12
|
|
|
|
; 3 = delay 25+10, 20 open, 10
|
|
|
|
; 3 = delay 25+ 8, 24 open, 8
|
|
|
|
; 3 = delay 25+ 6, 28 open, 6
|
|
|
|
; 3 = delay 25+ 4, 32 open, 4
|
|
|
|
; 3 = delay 25+ 2, 36 open, 2
|
|
|
|
; 3 = delay 25+ 0, 40 open, 0
|
|
|
|
|
|
|
|
ldx #192 ; 2
|
|
|
|
xloop:
|
|
|
|
lda #14 ; 18-4 ; 2
|
|
|
|
jsr delay_a ; 39
|
|
|
|
;===========
|
|
|
|
; 41
|
|
|
|
|
|
|
|
bit SET_TEXT ; 4
|
|
|
|
nop ; 2
|
|
|
|
nop ; 2
|
|
|
|
bit SET_GR ; 4
|
|
|
|
;===========
|
|
|
|
; 12
|
|
|
|
|
|
|
|
nop ; 2
|
|
|
|
nop ; 2
|
|
|
|
lda $0 ; 3
|
|
|
|
dex ; 2
|
|
|
|
bne xloop ; 3
|
|
|
|
;============
|
|
|
|
; 12
|
2018-09-23 03:07:59 +00:00
|
|
|
; kill 65*192 = 12480
|
|
|
|
|
|
|
|
; Try X=24 Y=99 cycles=12475 R5
|
|
|
|
|
2018-09-23 17:44:03 +00:00
|
|
|
; nop
|
|
|
|
; lda $0
|
|
|
|
;
|
|
|
|
; ldy #99 ; 2
|
|
|
|
;loopcoC:ldx #24 ; 2
|
|
|
|
;loopcoD:dex ; 2
|
|
|
|
; bne loopcoD ; 2nt/3
|
|
|
|
; dey ; 2
|
|
|
|
; bne loopcoC ; 2nt/3
|
2018-09-23 03:07:59 +00:00
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
;======================================================
|
|
|
|
; We have 4550 cycles in the vblank, use them wisely
|
|
|
|
;======================================================
|
|
|
|
; do_nothing should be 4550
|
|
|
|
; -10 keyboard handling
|
2018-09-23 17:44:03 +00:00
|
|
|
; -1 leftover from main screen
|
|
|
|
; -15
|
|
|
|
; -12
|
|
|
|
; -46
|
|
|
|
; = 4466
|
2018-09-23 03:07:59 +00:00
|
|
|
|
2018-09-23 17:44:03 +00:00
|
|
|
|
|
|
|
; run the 2Hz counter, overflow at 30 60Hz frames
|
2018-09-23 03:07:59 +00:00
|
|
|
clc ; 2
|
|
|
|
lda BOTTOM ; 3
|
|
|
|
adc #1 ; 2
|
|
|
|
sta BOTTOM ; 3
|
|
|
|
cmp #30 ; 2
|
2018-09-23 17:44:03 +00:00
|
|
|
bne not_thirty ; 3
|
|
|
|
;===========
|
|
|
|
; 15
|
2018-09-23 03:07:59 +00:00
|
|
|
thirty:
|
2018-09-23 17:44:03 +00:00
|
|
|
; -1
|
2018-09-23 03:07:59 +00:00
|
|
|
lda #0 ; 2
|
|
|
|
sta BOTTOM ; 3
|
2018-09-23 17:44:03 +00:00
|
|
|
inc TOP ; 5
|
|
|
|
jmp done_thirty ; 3
|
|
|
|
;===========
|
|
|
|
; 12
|
2018-09-23 03:07:59 +00:00
|
|
|
|
2018-09-23 17:44:03 +00:00
|
|
|
not_thirty:
|
|
|
|
lda TOP ; 3
|
|
|
|
lda TOP ; 3
|
|
|
|
lda TOP ; 3
|
|
|
|
lda TOP ; 3
|
|
|
|
;===========
|
|
|
|
; 12
|
2018-09-23 03:07:59 +00:00
|
|
|
|
2018-09-23 17:44:03 +00:00
|
|
|
done_thirty:
|
2018-09-23 03:07:59 +00:00
|
|
|
; handle the cursor
|
|
|
|
; FIXME: not aligned well. Do we care?
|
|
|
|
|
|
|
|
lda TOP ; 3
|
|
|
|
and #$1 ; 2
|
2018-09-23 17:44:03 +00:00
|
|
|
beq cursor_off ; 3
|
|
|
|
;============
|
|
|
|
; 8
|
2018-09-23 03:07:59 +00:00
|
|
|
cursor_on:
|
2018-09-23 17:44:03 +00:00
|
|
|
; -1
|
2018-09-23 03:07:59 +00:00
|
|
|
; it's lSB first
|
|
|
|
; blue is 6
|
|
|
|
; 1 1111110
|
|
|
|
lda #$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 $2F80 ; 59 ; 4
|
|
|
|
|
|
|
|
jmp cursor_done ; 3
|
2018-09-23 17:44:03 +00:00
|
|
|
;============
|
|
|
|
; 38
|
2018-09-23 03:07:59 +00:00
|
|
|
cursor_off:
|
|
|
|
; blue is 6
|
|
|
|
; 1 1010101
|
|
|
|
lda #$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
|
2018-09-23 17:44:03 +00:00
|
|
|
nop ; 2
|
|
|
|
;============
|
|
|
|
; 38
|
2018-09-23 03:07:59 +00:00
|
|
|
|
|
|
|
|
|
|
|
cursor_done:
|
|
|
|
|
2018-09-23 17:44:03 +00:00
|
|
|
; Try X=17 Y=49 cycles=4460 R6
|
|
|
|
nop
|
|
|
|
nop
|
2018-09-23 03:07:59 +00:00
|
|
|
nop
|
|
|
|
|
2018-09-23 17:44:03 +00:00
|
|
|
ldy #49 ; 2
|
|
|
|
loopcoE:ldx #17 ; 2
|
2018-09-23 03:07:59 +00:00
|
|
|
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:
|
|
|
|
rts ; 6
|
2018-09-17 04:11:35 +00:00
|
|
|
|
|
|
|
;===================
|
|
|
|
; graphics
|
|
|
|
;===================
|
|
|
|
c64:
|
|
|
|
.incbin "c64.img.lz4",11
|
|
|
|
c64_end:
|