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megademo: hook up improved vapor lock
still issues :(
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Vince Weaver
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3029d4220b
@ -21,7 +21,7 @@ MEGADEMO: megademo.o
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megademo.o: megademo.s \
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zp.inc hardware.inc \
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gr_hline.s gr_offsets.s vapor_lock.s \
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gr_hline.s gr_offsets.s vapor_lock.s delay_a.s \
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c64_opener.s c64.img.lz4 \
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falling_apple.s apple_40_96.inc
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ca65 -o megademo.o megademo.s -l megademo.lst
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25
megademo/delay_a.s
Normal file
25
megademo/delay_a.s
Normal file
@ -0,0 +1,25 @@
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; From http://6502org.wikidot.com/software-delay
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; 25+A cycles (including JSR), 19 bytes (excluding JSR)
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;
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; The branches must not cross page boundaries!
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;
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; Cycles Accumulator Carry flag
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; 0 1 2 3 4 5 6 (hex) 0 1 2 3 4 5 6
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; jsr delay_a ; 6 6 6 6 6 6 6 00 01 02 03 04 05 06
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dly0: sbc #7
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delay_a:cmp #7 ; 2 2 2 2 2 2 2 00 01 02 03 04 05 06 0 0 0 0 0 0 0
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bcs dly0 ; 2 2 2 2 2 2 2 00 01 02 03 04 05 06 0 0 0 0 0 0 0
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lsr ; 2 2 2 2 2 2 2 00 00 01 01 02 02 03 0 1 0 1 0 1 0
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bcs dly1 ; 2 3 2 3 2 3 2 00 00 01 01 02 02 03 0 1 0 1 0 1 0
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dly1: beq dly2 ; 3 3 2 2 2 2 2 00 00 01 01 02 02 03 0 1 0 1 0 1 0
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lsr ; 2 2 2 2 2 00 00 01 01 01 1 1 0 0 1
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beq dly3 ; 3 3 2 2 2 00 00 01 01 01 1 1 0 0 1
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bcc dly3 ; 3 3 2 01 01 01 0 0 1
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dly2: bne dly3 ; 2 2 3 00 00 01 0 1 0
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dly3: rts ; 6 6 6 6 6 6 6 00 00 00 00 01 01 01 0 1 1 1 0 0 1
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;
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; Total cycles: 25 26 27 28 29 30 31
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@ -73,23 +73,29 @@ falling_apple:
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; setup graphics for vapor lock
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;==============================
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jsr vapor_lock ; 6?
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jsr vapor_lock ; 6
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; vapor lock returns with us at beginning of hsync in line
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; 114 (7410 cycles), so with 5070 lines to go
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jsr gr_copy_to_current ; 6+ 9292
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; 10193 - 9298 = 889
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; Fudge factor (unknown) -24 = 865
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; now we have 322 left
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; GR part
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bit LORES ; 4
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bit SET_GR ; 4
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bit FULLGR ; 4
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; Try X=88 Y=2 cycles=893 R2
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; 322 - 12 = 310
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; - 3 for jmp
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; 307
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nop
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ldy #2 ; 2
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; Try X=9 Y=6 cycles=307
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ldy #6 ; 2
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loopA:
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ldx #88 ; 2
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ldx #9 ; 2
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loopB:
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dex ; 2
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bne loopB ; 2nt/3
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@ -38,4 +38,4 @@ loop_forever:
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.include "gr_offsets.s"
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.include "gr_hline.s"
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.include "vapor_lock.s"
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.include "delay_a.s"
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@ -1,3 +1,40 @@
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; This took a while to track down
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; On Apple II/II+ the horiz blanking addr are $1000 higher than on IIe
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; So on II+ were outside video area, so unlikely to be our set value
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; (unless I foolishly use $ff which some uninitialized mem is set to)
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; Lots of this color fiddling is to make sure you don't accidentally
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; get runs of colors on IIe due to the horiz blank
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; 0-5 aqua 6-12 = grey, 13 - 20 = yellow, 21-23 = aqua rainbow 14
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;
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;
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;16 0 YA
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;17 1 YA
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;18 2 YA
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;19 3 YA
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;20 4 YA
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;21 5 AA
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;22 6 AG
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;23 7 AG
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;0 8 AG
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;1 9 AG
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;2 10 AG
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;3 11 AG
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;4 12 AG
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;5 13 AY ****
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;6 14 GY RAINBOW
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;7 15 GY
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;8 16 GY
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;9 17 GY
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;10 18 GY
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;11 19 GY
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;12 20 GY
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;13 21 YA
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;14 22 YA
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;15 23 YA
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;==============================
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; setup graphics for vapor lock
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;==============================
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@ -6,20 +43,39 @@ vapor_lock:
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; Clear Page0
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lda #$0
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sta DRAW_PAGE
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lda #$44
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lda #$ee ; full screen white $ff
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jsr clear_gr
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; Make screen half green
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lda #$11
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lda #$dd
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ldy #40
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jsr clear_page_loop ; make top half grey2 $aa
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lda #$aa
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ldy #24
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jsr clear_page_loop
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jsr clear_page_loop ; make top half grey2 $aa
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lda #$ee
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ldy #10
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jsr clear_page_loop ; make top half grey2 $aa
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; set up a rainbow to aid in exact lock
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ldy #00
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rainbow_loop:
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tya
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sta $728+20,Y
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iny
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cpy #20
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bne rainbow_loop
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;btt:
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; jmp btt
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;=====================================================
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; attempt vapor lock
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; by reading the "floating bus" we can see most recently
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; written value of the display
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; we look for $55 (which is the grey line)
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;=====================================================
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; See:
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; Have an Apple Split by Bob Bishop
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@ -33,26 +89,128 @@ vapor_lock:
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; to avoid false positive found if the horiz blanking is mirroring
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; the line (max 3 repeats in that case)
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vapor_lock_loop: ; first make sure we have all zeroes
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LDA #$11
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vapor_lock_loop:
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; first make sure we have a full line of $aa
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lda #$aa ; 2
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zxloop:
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LDX #$04
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ldx #$04 ; 2
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wiloop:
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CMP $C051
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BNE zxloop
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DEX
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BNE wiloop
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cmp $C051 ; read the floating bus ; 4
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bne zxloop ; if not, start from scratch ; 2/3
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dex ; we were, dec ; 2
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bne wiloop ; if not 4 of them, restart ; 3/2
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LDA #$44 ; now look for our border color (4 times)
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; if we get here we read 4 proper pixels, 11 apart (2+4+2+2+3)
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; 0 11 22 33, clock at 34
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; 1 12 23 34, clock at 35
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; 2 13 24 35, clock at 36
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; 3 14 25 36, clock at 37
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; 4 15 26 37, clock at 38
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; 5 16 27 38, clock at 39
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; 6 17 28 39, clock at 40
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; X X X X
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; X X X X
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; X X X X
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; X X X X
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; X X X X
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; X X X X
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; X X X X
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; 0123456789012345678901234 0123456789012345678901234567890123456789
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; 1 2 1 2 3
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; hsync pixels
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; XXXXXXXXXXXXXXXXXXXXXXXXX 4444444444444444444444444444440123456789
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; now look for the color change that
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; happens at line 13*8 = 104
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lda #$dd ; 2
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zloop:
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LDX #$04
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ldx #$04 ; 2
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qloop:
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CMP $C051
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BNE zloop
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DEX
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BNE qloop
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cmp $C051 ; read floating bus ; 4
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bne zloop ; 2/3
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dex ; 2
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bne qloop ; 3/2
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;============
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; 11
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rts
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; Found it!
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; if we get here we read 4 proper pixels, 11 apart (2+4+2+2+3)
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; 0 11 22 33, clock at 34
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; 1 12 23 34, clock at 35
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; 2 13 24 35, clock at 36
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; 3 14 25 36, clock at 37
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; 4 15 26 37, clock at 38
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; 5 16 27 38, clock at 39
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; 6 17 28 39, clock at 40
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; In theory near end of line 104
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; now skip ahead 8 lines and read from the rainbow pattern we set
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; up to find our exact location
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; delay 65 * 8 = 520
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; we back off a few to make sure we're not in the horiz blank
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; try to delay 510
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lda #230 ; 2
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jsr delay_a ; delay 25+230 = 255
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lda #226 ; 2
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jsr delay_a ; delay 25+226 = 251
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; now near end of line 112
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lda $C051 ; 4
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;kbb:
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; jmp kbb
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; we are in theory on line $728 = 14*8 = 112
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; so 112*65 = 7280 cycles from start
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; we are actualy 25+20+A pixels in
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; 7325+A
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; Our goal is line 114 at 7410 cycles
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; 7410 - 7325 = 85
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; so kill 85-A cycles
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; -6 to do subtraction
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; -6 for rts
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; -25 for delay_a overhead
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eor #$ff ; 2
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sec ; 2
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adc #48 ; 2
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jsr delay_a ; should total 48 cycles
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done_vapor_lock:
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rts ; 6
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; Some random related work
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; Docs:
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; Lancaster
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; Bishop
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; Sather
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; Vaguely relevant but no help with the Apple II+ issue
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;
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; Eamon: Screen display and timing synchronization
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; on the Apple IIe and Apple IIgs
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;
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; Adams: Visually presented verbal stimuli by assembly
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; language on the Apple II computer.
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; Cavanagh and Anstis: Visual psychophysics on the
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; Apple II: Getting started
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