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movplay.s
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movplay.s
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;
; 4C00-4EFF Playback display list
; 4F00-4FFF Error display list
; 5000-5FFF Framebuffer
;
icl 'hardware.inc'
icl 'os.inc'
ide_base = $d5f0
ide_data = $d5f0
ide_status equ ide_base+7
org $0
opt o-
zpsndbuf:
org $c0
zp_start:
log_curx dta 0
log_curln dta a(0)
log_srcptr dta a(0)
log_lncnt dta 0
pages dta 0
vblanks dta 0
waitcnt dta 0
nextpg dta 0
delycnt dta 0
pending dta 0
sector dta 0
dta 0
dta 0
dta 0
d0 dta 0
d1 dta 0
d2 dta 0
d3 dta 0
d4 dta 0
d5 dta 0
d6 dta 0
d7 dta 0
a0 dta a(0)
a1 dta a(0)
a2 dta a(0)
a3 dta a(0)
zp_end:
;============================================================================
org $2800
opt o+
.proc main
sei
;clear PIA interrupts
mva #$3c pactl
lda porta
lda portb
;zero working variables
ldx #zp_end-zp_start
lda #0
clear_zp:
sta zp_start,x
dex
bpl clear_zp
;nuke startup bytes to force cold reset
sta pupbt1
sta pupbt2
sta pupbt3
;set up audio
; timer 1: 16-bit linked, audio enabled
; timer 2: 16-bit linked, audio disabled
lda #$a0
sta audc1
sta audc2
sta audc3
sta audc4
mva #$ff audf2
mva #$71 audctl
mva #$03 skctl
;initialize text display
jsr FlipToTextDisplay
;set up NTSC/PAL differences
lda #$08
bit pal
bne is_ntsc
mva #$40 prior_byte_1
mva #$c7 prior_byte_2
mva #<(-67) wait_loop_count
mva #<(soundbuf-$100+68) wait_loop_offset
jmp is_pal
is_ntsc:
mva #$c0 prior_byte_1
mva #$47 prior_byte_2
mva #<(-17) wait_loop_count
mva #<(soundbuf-$100+18) wait_loop_offset
is_pal:
ldx #$01
stx $d510
dex
ldy #$20
@
lda ide_data
dex
bne @-
dey
bne @-
restart:
mva #$00 colbk
; mva #0 irqen
; mva #$40 irqen
; bit:rvs irqst
jsr FlipToVideoDisplay
;set up for reading
lda #248/2
cmp:req vcount
cmp:rne vcount
mwa #dlist_wait dlistl
mva #$22 dmactl
mva #>ide_base chbase
sta nmires
sta wsync
jmp main_loop_start
main_loop_delay:
mva #0 dmactl
lda #124
cmp:rne vcount
mwa #dlist dlistl
mva #$22 dmactl
err:
main_loop:
;MAIN KERNEL
;
;With normal width lines (40 bytes), we need some pad bytes to ensure that
;sector boundaries are maintained.
;DLI should be on by now; if not, wait for it.
lda:rpl nmist
sta nmires
:7 nop
ldx #$c0 ;2 (changed to $47 for PAL)
prior_byte_1 = * - 1
lda #$47 ;2 (changed to $c0 for PAL)
prior_byte_2 = * - 1
pha:pla
sta wsync
bit $00 ;103, 104, 105
; 1 2 3 4 5 6 7 8 9 0 1
;012345678901234567890123456789012345678901234567890123456789012345678901234567890123456789012345678901234567890123
;===========================================================================================================....... -> 7+16 = 23 cycles
;.D..............F.FCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCRVV.V... -> 7+16 = 23 cycles
;.D..............F.FCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCRVV.V... -> 7+25 = 32 cycles
;.D................F.FCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCFCRC..............
.rept 192
;jump to right before even line (start vscrol region - vscrol=7)
;jump to right before odd line (end vscrol region - vscrol=0)
;24 cycles
.if (#%2)==0
sta prior ;106, 107, 108, 109
sta vscrol ;110, 111, 112, 113
sta chactl ;0, 2, 3, 4
.else
stx prior ;4
stx vscrol ;4
stx chactl ;4
.endif
ldy zpsndbuf+# ;5, 6, 7
sty audf1 ;8, 9, 10, 11
sty stimer ;12, 13, 14, 15
.if [(#%3)==2 && #!=191]
nop:nop
bit.b $0
nop
.endif
.endr
;With 182 scanlines, there are 320 bytes left over. 262 of these are used for
;sound, and the other 58 we toss. We read 10 bytes a scanline and so this
;takes 32 scanlines.
ldx #$e0
;we are coming in hot from the last visible scanline, so we need to skip
;the wsync
bne sndread_loop_start
sndread_loop:
sta wsync ;4
sndread_loop_start:
bit $00
ldy ide_data ;4
mva ide_data zpsndbuf+$20,x ;9
lda ide_data ;4
sty audf1 ;4
sty stimer ;4
sta zpsndbuf+$40,x ;4
mva ide_data zpsndbuf+$60,x ;9
mva ide_data zpsndbuf+$80,x ;9
mva ide_data zpsndbuf+$a0,x ;9
mva ide_data zpsndbuf+$c0,x ;9
mva ide_data soundbuf-$e0,x ;9
mva ide_data soundbuf-$c0,x ;9
lda ide_data ;4
inx ;2
bne sndread_loop ;3
sta wsync
ldy ide_data
mva ide_data soundbuf+$40
lda ide_data
bit $00
sty audf1
sty stimer
:7 lda ide_data ;28
mwa #dlist dlistl
ldx #<(-18)
eat_loop:
sta wsync
ldy ide_data
mva ide_data soundbuf+$40-<(-19),x
lda ide_data
nop
sty audf1
sty stimer
cmp #0
bne resync
.rept 7
; here max 40 cycles.
lda ide_data ;28
bne resync
.endr
inx
bne eat_loop
;Do a line of audio, so we get some time again.
sta wsync
ldy ide_data
lda ide_data
pha:pla
bit $00
sty audf1
sty stimer
main_loop_start:
; cca 41
;:17 nop
lda $d510 ;4
beq stream_cont ;3
// this is when eof or wrong byte /not 0/ occurs
// tell the cart to finish? reset?
lda #$01
sta $d511
sta wsync
sta wsync
lda #$00
sta $d511
// RESET the Atari!
jmp $e477
stream_cont:
;We have 47 scanlines to wait (~4ms), so in the meantime let's play
;some audio.
sta wsync
ldy soundbuf
bit $0100
bit $00
nop
lda consol
lsr
sty audf1
sty stimer
ldx #<(-17) ;modified to -67 for PAL
wait_loop_count = *-1
wait_loop:
sta wsync
ldy soundbuf-$100+18,x
wait_loop_offset = *-2
:2 nop
;bit.b $00
;bit $0100
lda consol
and #4
bne @+
jmp main_loop_start+5
resync: ; a groundstone to jump off because too far to orig bne
jmp do_resync
@
;lsr
;nop
sty audf1
sty stimer
inx
bne wait_loop
jmp main_loop
; find the right position in the stream and jump to next frame.
do_resync:
;shut off all interrupts and kill display
mva #0 nmien
mva #0 dmactl
sta nmires
; sta counter
reset:
ldy #0
sty audf1
sty stimer
lda ide_data
beq reset
next_data
ldx table1,y
beq check0
cmp #0
bne good
beq reset
check0:
cmp #0
bne reset
good:
lda #0
sta audf1
sta stimer
lda ide_data
iny
beq next_stage
jmp next_data
next_stage:
nextpage:
ldx table2,y
beq check0_
cmp #0
bne good_
beq reset
check0_:
cmp #0
bne reset
good_:
lda #0
sta audf1
sta stimer
iny
beq checkcomplete
lda ide_data
jmp nextpage
checkcomplete:
jmp restart
table1:
dta $ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$00,$ff,$ff,$ff,$ff,$ff,$ff
dta $ff,$ff,$ff,$00,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$00,$ff,$ff
dta $ff,$ff,$ff,$ff,$ff,$ff,$ff,$00,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff
dta $ff,$00,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$00,$ff,$ff,$ff,$ff
dta $ff,$ff,$ff,$ff,$ff,$00,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$00
dta $ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$00,$ff,$ff,$ff,$ff,$ff,$ff
dta $ff,$ff,$ff,$00,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$00,$ff,$ff
dta $ff,$ff,$ff,$ff,$ff,$ff,$ff,$00,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff
dta $ff,$00,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$00,$ff,$ff,$ff,$ff
dta $ff,$ff,$ff,$ff,$ff,$00,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$00
dta $ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$00,$ff,$ff,$ff,$ff,$ff,$ff
dta $ff,$ff,$ff,$00,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$00,$ff,$ff
dta $ff,$ff,$ff,$ff,$ff,$ff,$ff,$00,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff
dta $ff,$00,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$00,$ff,$ff,$ff,$ff
dta $ff,$ff,$ff,$ff,$ff,$00,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$00
dta $ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$00,$ff,$ff,$ff,$ff,$ff,$ff
table2:
dta $ff,$ff,$ff,$00,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$00,$ff,$ff
dta $ff,$ff,$ff,$ff,$ff,$ff,$ff,$00,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff
dta $ff,$00,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$00,$ff,$ff,$ff,$ff
dta $ff,$ff,$ff,$ff,$ff,$00,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$ff,$00
dta $ff,$ff,$00,$00,$00,$00,$00,$00,$00,$00,$ff,$ff,$00,$00,$00,$00
dta $00,$00,$00,$00,$ff,$ff,$00,$00,$00,$00,$00,$00,$00,$00,$ff,$ff
dta $00,$00,$00,$00,$00,$00,$00,$00,$ff,$ff,$00,$00,$00,$00,$00,$00
dta $00,$00,$ff,$ff,$00,$00,$00,$00,$00,$00,$00,$00,$ff,$ff,$00,$00
dta $00,$00,$00,$00,$00,$00,$ff,$ff,$00,$00,$00,$00,$00,$00,$00,$00
dta $ff,$ff,$00,$00,$00,$00,$00,$00,$00,$00,$ff,$ff,$00,$00,$00,$00
dta $00,$00,$00,$00,$ff,$ff,$00,$00,$00,$00,$00,$00,$00,$00,$ff,$ff
dta $00,$00,$00,$00,$00,$00,$00,$00,$ff,$ff,$00,$00,$00,$00,$00,$00
dta $00,$00,$ff,$ff,$00,$00,$00,$00,$00,$00,$00,$00,$ff,$ff,$00,$00
dta $00,$00,$00,$00,$00,$00,$ff,$ff,$00,$00,$00,$00,$00,$00,$00,$00
dta $ff,$ff,$00,$00,$00,$00,$00,$00,$00,$00,$ff,$ff,$00,$00,$00,$00
dta $00,$00,$00,$00,$ff,$ff,$00,$00,$00,$00,$00,$00,$00,$00,$ff,$00
.endp
;============================================================================
.proc FlipToVideoDisplay
;shut off all interrupts and kill display
mva #0 nmien
mva #0 dmactl
sta nmires
;move sprites out of the way
ldx #7
lda #0
sprclear:
sta hposp0,x
dex
bpl sprclear
;clear playfield page
lda #[(ide_data&$3ff)/8]
ldx #>framebuf
ldy #0
clear_loop:
stx clear_loop_2+2
clear_loop_2:
sta framebuf,y
iny
bne clear_loop_2
inx
cpx #(>framebuf)+$10
bne clear_loop
;prime memory scan counter to $4000
lda #124
cmp:rne vcount
mwx #dlist_init dlistl
mva #$20 dmactl
sta wsync
sta wsync
cmp:rne vcount
mva #12 hscrol
mva #7 vscrol
mva #$af audc1
rts
.endp
;============================================================================
.proc FlipToTextDisplay
;kill audio and VBI
sei
lda #0
sta nmien
mva #$a0 audc1
;kill VBI
mva #0 nmien
;turn ROM back on
mva #$ff portb
lda #248/2
cmp:rne vcount
;reset display list
mwa #dlist_text dlistl
lda #0
sta prior
sta colbk
mva #$22 dmactl
mva #$e0 chbase
rts
.endp
;============================================================================
org $4b00
soundbuf:
;============================================================================
org $4c00
dlist:
dta $70
dta $70
dta $f0
.rept 32
dta $32,$12,$22
dta $12,$32,$02
.endr
dlist_wait:
dta $41,a(dlist)
dlist_init:
dta $4f,a(framebuf)
dta $41,a(dlist_init)
;============================================================================
org $4f00
dlist_text:
dta $70
dta $70
dta $70
dta $42,a(framebuf)
:23 dta $02
dta $41,a(dlist_text)
org $5000
framebuf:
run main
end