mirror of
https://github.com/deater/dos33fsprogs.git
synced 2024-11-16 23:20:43 +00:00
628 lines
14 KiB
ArmAsm
628 lines
14 KiB
ArmAsm
; Kansasfest HackFest Entry
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; Zero Page
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FRAMEBUFFER = $00 ; $00 - $0F
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YPOS = $10
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DRAW_PAGE = $EE
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CURRENT_OFFSET = $EF
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OFFSET_GOVERNOR = $F0
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; Soft Switches
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SET_GR = $C050 ; Enable graphics
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FULLGR = $C052 ; Full screen, no text
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PAGE0 = $C054 ; Page0
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PAGE1 = $C055 ; Page1
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LORES = $C056 ; Enable LORES graphics
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; ROM routines
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TEXT = $FB36 ;; Set text mode
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HOME = $FC58 ;; Clear the text screen
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WAIT = $FCA8 ;; delay 1/2(26+27A+5A^2) us
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;===================
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; init screen
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jsr TEXT
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jsr HOME
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lda #0
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sta DRAW_PAGE
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sta CURRENT_OFFSET
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sta OFFSET_GOVERNOR
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lda #3
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sta YPOS
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; Clear Page0
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lda #$00
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sta DRAW_PAGE
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jsr clear_gr
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; draw border line
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lda #$55
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ldy #38
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jsr hline
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; Clear Page1
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lda #$4
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sta DRAW_PAGE
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lda #$44
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jsr clear_gr
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; draw border line
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lda #$55
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ldy #38
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jsr hline
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;==================
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; Draw Temp Rasters
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;==================
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ldx #19 ; 2
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raster_loop:
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lda #00 ; 2
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sta $600,X ; 5
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lda #01 ; 2
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sta $680,X ; 5
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lda #02 ; 2
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sta $700,X ; 5
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lda #03 ; 2
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sta $780,X ; 5
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lda #04 ; 2
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sta $428,X ; 5
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lda #05 ; 2
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sta $4a8,X ; 5
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lda #06 ; 2
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sta $528,X ; 5
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lda #07 ; 2
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sta $5a8,X ; 5
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lda #08
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sta $A00,X
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lda #09
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sta $A80,X
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lda #10
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sta $B00,X
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lda #11
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sta $B80,X
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lda #12
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sta $828,X
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lda #13
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sta $8a8,X
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lda #14
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sta $928,X
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lda #15
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sta $9a8,X
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dex ; 2
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bpl raster_loop ; 2nt/3
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;=====================================
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; temporarily draw HELLO
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;=====================================
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ldy CURRENT_OFFSET
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ldx #0
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data_loop2:
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lda words,Y
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sta $6d0,X
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lda words2,Y
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sta $750,X
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lda words3,Y
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sta $ad0,X
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lda words4,Y
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sta $b50,X
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iny
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inx
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cpx #40
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bne data_loop2
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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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; Softalk, October 1982
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; Challenges: each scan line scans 40 bytes.
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; The blanking happens at the *beginning*
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; So 65 bytes are scanned, starting at adress of the line - 25
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; the scan takes 8 cycles, look for 4 repeats of the value
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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 #$00
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zxloop:
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LDX #$04
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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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LDA #$55 ; now look for four all grey
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zloop:
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LDX #$04
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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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; found first line of low-res grey, need to kill time
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; until we can enter at top of screen
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; so we want roughly 10 lines * 4 = 40*65 = 2600+4550-65
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; +4550 - 65 (for the scanline we missed) = 7085 - 12 = 7073
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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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; want 7073
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; Try X=26 Y=52 cycles=7073
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lda #0 ; 2
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lda #0 ; 2
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ldy #52 ; 2
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loopA:
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ldx #26 ; 2
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loopB:
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dex ; 2
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bne loopB ; 2nt/3
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dey ; 2
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bne loopA ; 2nt/3
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jmp display_loop
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.align $100
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;================================================
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; Display Loop
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;================================================
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; each scan line 65 cycles
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; 1 cycle each byte (40cycles) + 25 for horizontal
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; Total of 12480 cycles to draw screen
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; Vertical blank = 4550 cycles (70 scan lines)
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; Total of 17030 cycles to get back to where was
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; We want to alternate between page1 and page2 every 65 cycles
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; vblank = 4550 cycles to do scrolling
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; 2 + 48*( (4+2+25*(2+3)) + (4+2+23*(2+3)+4+5)) + 9)
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; 48*[(6+125)-1] + [(6+115+10)-1]
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display_loop:
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ldy #48 ; 2
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outer_loop:
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bit PAGE0 ; 4
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ldx #25 ; 130 cycles with PAGE0 ; 2
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page0_loop: ; delay 126+bit
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dex ; 2
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bne page0_loop ; 2/3
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bit PAGE1 ; 4
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ldx #23 ; 130 cycles with PAGE1 ; 2
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page1_loop: ; delay 115+(7 loop)+4 (bit)+4(extra)
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dex ; 2
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bne page1_loop ; 2/3
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nop ; 2
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lda DRAW_PAGE ; 3
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dey ; 2
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bne outer_loop ; 2/3
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;======================================================
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; We have 4550 cycles in the vblank, use them wisely
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;======================================================
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; delay 1652 (4550 +1 from falltrough, -2 for loadup, -2661 scroll -3)
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; - 147 - 83 -3
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; Try X=2 Y=103 cycles=1649 R2
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; waste 2 cycles
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lda DRAW_PAGE ; 3
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; lda DRAW_PAGE ; 3
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; nop ; 2
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; nop
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ldy #103 ; 2
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loop5:
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ldx #2 ; 2
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loop6:
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dex ; 2
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bne loop6 ; 2nt/3
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dey ; 2
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bne loop5 ; 2nt/3
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;==================
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; Clear Framebuffer
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;==================
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; 4 + 16*9 - 1 = 147
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lda #0 ; 2
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ldx #15 ; 2
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clear_fb_loop:
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sta FRAMEBUFFER,X ; 4
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dex ; 2
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bpl clear_fb_loop ; 2nt/3
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;==================
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; Set Rasterbar
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;==================
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; 16 + 52 + 15 = 83
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lda YPOS ; 3
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and #$fc
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lsr ; 2
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; lsr ; 2
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tax ; 2
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lda YPOS ; 3
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and #$3 ; 2
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cmp #$0 ; 2
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; zero_rasterbar = 42 (add 10)
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; one_rasterbar = 46 (add 6)
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; two_rasterbar = 50 (add 2)
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; three_rasterbar = 52
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beq zero_rasterbar
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; 2
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cmp #$1 ; 2
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beq one_rasterbar
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; 2
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cmp #$2 ; 2
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beq two_rasterbar
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; 2
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bne three_rasterbar
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zero_rasterbar:
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; 3
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lda #$b1 ; 2
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sta FRAMEBUFFER,X ; 4
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lda #$f3 ; 2
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sta FRAMEBUFFER+1,X ; 4
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lda #$1b ; 2
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sta FRAMEBUFFER+2,X ; 4
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lda #$03 ; 2
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sta FRAMEBUFFER+3,X ; 4
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lda #$00 ; 2
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sta FRAMEBUFFER+4,X ; 4
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lda #$00 ; 2
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sta FRAMEBUFFER+5,X ; 4
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nop
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nop
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nop
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nop
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nop
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jmp done_draw_rasterbar ; 3
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;===========
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; 42
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one_rasterbar:
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; 4+3
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lda #$30 ; 2
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sta FRAMEBUFFER,X ; 4
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lda #$b1 ; 2
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sta FRAMEBUFFER+1,X ; 4
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lda #$3f ; 2
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sta FRAMEBUFFER+2,X ; 4
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lda #$1b ; 2
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sta FRAMEBUFFER+3,X ; 4
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lda #$00 ; 2
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sta FRAMEBUFFER+4,X ; 4
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lda #$00 ; 2
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sta FRAMEBUFFER+5,X ; 4
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nop
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nop
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nop
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jmp done_draw_rasterbar ; 3
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;==========
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; 46
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two_rasterbar:
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; 8+3
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lda #$10 ; 2
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sta FRAMEBUFFER,X ; 4
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lda #$30 ; 2
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sta FRAMEBUFFER+1,X ; 4
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lda #$bb ; 2
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sta FRAMEBUFFER+2,X ; 4
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lda #$3f ; 2
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sta FRAMEBUFFER+3,X ; 4
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lda #$01 ; 2
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sta FRAMEBUFFER+4,X ; 4
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lda #$00 ; 2
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sta FRAMEBUFFER+5,X ; 4
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nop
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jmp done_draw_rasterbar ; 3
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;==========
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; 50
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three_rasterbar:
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; 10+3
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lda #$00 ; 2
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sta FRAMEBUFFER,X ; 4
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lda #$10 ; 2
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sta FRAMEBUFFER+1,X ; 4
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lda #$f3 ; 2
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sta FRAMEBUFFER+2,X ; 4
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lda #$bb ; 2
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sta FRAMEBUFFER+3,X ; 4
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lda #$03 ; 2
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sta FRAMEBUFFER+4,X ; 4
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lda #$01 ; 2
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sta FRAMEBUFFER+5,X ; 4
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jmp done_draw_rasterbar ; 3
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;==========
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; 52
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done_draw_rasterbar:
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; movement = 7 + 5 + 3 = 15
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ldx YPOS ; 3
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; nop
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inx ; 2
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cpx #24 ; 2
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beq raster_bottom ;
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; 2
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jmp raster_move_done ; 3
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raster_bottom:
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; 3
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ldx #0 ; 2
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raster_move_done:
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stx YPOS ; 3
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jmp draw_rasterbars ; 3
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.align $100
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;==================
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; Draw Rasterbars
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;==================
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draw_rasterbars:
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; 2 + YSIZE*[(8*16) + 5] - 1
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; 2 + (20*133) -1
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; 2661 cycles
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ldx #19 ; 2
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raster_loop2:
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lda FRAMEBUFFER ; 3
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sta $600,X ; 5
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lda FRAMEBUFFER+2 ; 3
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sta $680,X ; 5
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lda FRAMEBUFFER+4 ; 3
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sta $700,X ; 5
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lda FRAMEBUFFER+6 ; 3
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sta $780,X ; 5
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lda FRAMEBUFFER+8 ; 3
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sta $428,X ; 5
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lda FRAMEBUFFER+10 ; 3
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sta $4a8,X ; 5
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lda FRAMEBUFFER+12 ; 3
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sta $528,X ; 5
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lda FRAMEBUFFER+14 ; 3
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sta $5a8,X ; 5
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lda FRAMEBUFFER+1
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sta $A00,X
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lda FRAMEBUFFER+3
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sta $A80,X
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lda FRAMEBUFFER+5
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sta $B00,X
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lda FRAMEBUFFER+7
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sta $B80,X
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lda FRAMEBUFFER+9
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sta $828,X
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lda FRAMEBUFFER+11
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sta $8a8,X
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lda FRAMEBUFFER+13
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sta $928,X
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lda FRAMEBUFFER+15
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sta $9a8,X
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dex ; 2
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bpl raster_loop2 ; 2nt/3
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all_done:
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jmp display_loop ; 3
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;==================================
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; HLINE
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;==================================
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; Color in A
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; Y has which line
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hline:
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pha ; 3
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ldx gr_offsets,y ; 4+
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stx hline_loop+1 ; 4
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lda gr_offsets+1,y ; 4+
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clc ; 2
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adc DRAW_PAGE ; 3
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sta hline_loop+2 ; 4
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pla ; 4
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ldx #39 ; 2
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hline_loop:
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sta $5d0,X ; 38 ; 5
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dex ; 2
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bpl hline_loop ; 2nt/3
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rts ; 6
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;==========================
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; Clear gr screen
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;==========================
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; Color in A
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clear_gr:
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ldy #46
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clear_page_loop:
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jsr hline
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dey
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dey
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bpl clear_page_loop
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rts
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.align $100
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words:
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; H E L L O
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.byte $D1,$00,$D1,$00, $D1,$01,$00, $D1,$00,$00, $D1,$00,$00, $D0,$01,$D0,$00, $00, $00
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; K F E S T
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.byte $D1,$00,$D1,$00, $D1,$01,$00, $D1,$01,$00, $D1,$D1,$00, $01,$D1,$01,$00
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; 1 8 . . .
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.byte $00,$D1,$00, $D0,$01,$D0,$00, $00,$00,$00, $00,$00,$00, $00,$00,$00, $00,$00
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; H A V E
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.byte $D1,$00,$D1,$00, $D0,$01,$D0,$00, $D1,$00,$D1,$00, $D1,$01,$00, $00,$00
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; Y O U
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.byte $D1,$00,$D1,$00, $D0,$01,$D0,$00, $D1,$00,$D1,$00, $00,$00
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; E V E R
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.byte $D1,$01,$00, $D1,$00,$D1,$00, $D1,$01,$00, $D1,$01,$D1,$00, $00,$00
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; S E E N
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.byte $D1,$D1,$00, $D1,$01,$00, $D1,$01,$00, $D1,$00,$D0,$D1,$00, $00,$00
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; 4 0 x
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.byte $D1,$00,$D1,$00, $D0,$01,$D0,$00, $D0,$00,$D0,$00
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; 9 6
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.byte $D1,$01,$D1,$00, $D1,$01,$01,$00, $00,$00
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; L O R E S
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.byte $D1,$00,$00, $D0,$01,$D0,$00, $D1,$01,$D1,$00, $D1,$01,$00, $D1,$D1,$00
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; Apple
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.byte $00,$00,$C0,$C0,$CC,$C0,$00,$00
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; VMW Logo
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.byte $0,$0,$11,$11,$11,$11,$11,$44, $22,$22,$22,$22,$22,$44, $22,$22,$22,$22,$22,$00
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; Apple
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.byte $0,$0,$00,$C0,$C0,$CC,$C0,$0
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.repeat 64
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.byte $0
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.endrep
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words2:
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.byte $24,$04,$24,$00, $24,$20,$00, $24,$20,$00, $24,$20,$00, $04,$20,$04,$00, $00,$00
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.byte $24,$04,$20,$00, $24,$00,$00, $24,$20,$00, $20,$24,$00, $00,$24,$00,$00
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.byte $00,$24,$00, $04,$20,$04,$00, $20,$20,$00, $20,$20,$00, $20,$20,$00, $00,$00
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.byte $24,$04,$24,$00, $24,$00,$24,$00, $04,$20,$04,$00, $24,$20,$00, $00,$00
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.byte $00,$24,$00,$00, $04,$20,$04,$00, $24,$20,$24,$00, $00,$00
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.byte $24,$20,$00, $04,$20,$04,$00, $24,$20,$00, $24,$04,$20,$00, $00,$00
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.byte $20,$24,$00, $24,$20,$00, $24,$20,$00, $24,$00,$00,$24,$00, $00,$00
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.byte $00,$00,$24,$00, $04,$20,$04,$00, $00,$04,$00,$00
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.byte $00,$00,$24,$00, $24,$20,$24,$00, $00,$00
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.byte $24,$20,$00, $04,$20,$04,$00, $24,$04,$20,$00, $24,$20,$00, $20,$24,$00
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.byte $00,$29,$29,$29,$29,$20,$00,$00
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.byte $0,$0,$00,$01,$11,$41,$44,$44, $44,$42,$22,$42,$44,$44, $44,$42,$22,$02,$00,$00
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.byte $0,$0,$29,$29,$29,$29,$20,$0
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.repeat 64
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.byte $0
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.endrep
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words3:
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.byte $C9,$C0,$C9,$00, $C9,$C0,$00, $C9,$00,$00, $C9,$00,$00, $C9,$00,$C9,$00, $00,$00
|
|
.byte $C9,$C0,$09,$00, $C9,$C0,$00, $C9,$C0,$00, $C9,$C0,$00, $00,$C9,$00,$00
|
|
.byte $09,$C9,$00, $09,$C0,$09,$00, $00,$00,$00, $00,$00,$00, $00,$00,$00, $00,$00
|
|
.byte $C9,$C0,$C9,$00, $C9,$C0,$C9,$00, $C9,$00,$C9,$00, $C9,$C0,$00, $00,$00
|
|
.byte $09,$C0,$09,$00, $c9,$00,$c9,$00, $C9,$00,$C9,$00, $00,$00
|
|
.byte $C9,$C0,$00, $C9,$00,$C9,$00, $C9,$C0,$00, $C9,$C0,$C9,$00, $00,$00
|
|
.byte $C9,$C0,$00, $C9,$C0,$00, $C9,$C0,$00, $C9,$09,$00,$C9,$00, $00,$00
|
|
.byte $C9,$C0,$C9,$00, $C9,$00,$C9,$00, $00,$C0,$00,$00
|
|
.byte $C9,$C0,$C9,$00, $C9,$C0,$C0,$00, $00,$00
|
|
.byte $C9,$00,$00, $C9,$00,$C9,$00, $C9,$C0,$C9,$00, $C9,$C0,$00, $C9,$C0,$00
|
|
.byte $00,$D0,$D0,$DC,$D0,$00,$00,$00
|
|
.byte $0,$0,$01,$11,$11,$11,$41,$44, $42,$22,$22,$22,$42,$44, $42,$22,$22,$22,$02,$00
|
|
.byte $0,$0,$D0,$D0,$DC,$D0,$00,$0
|
|
|
|
.repeat 64
|
|
.byte $0
|
|
.endrep
|
|
words4:
|
|
.byte $06,$00,$06,$00, $06,$00,$00, $06,$00,$00, $06,$00,$00, $06,$00,$06,$00, $00,$00
|
|
.byte $06,$00,$06,$00, $06,$00,$00, $06,$00,$00, $00,$06,$00, $00,$06,$00,$00
|
|
.byte $00,$06,$00, $06,$00,$06,$00, $06,$06,$00, $06,$06,$00, $06,$06,$00, $00,$00
|
|
.byte $06,$00,$06,$00, $06,$00,$06,$00, $00,$06,$00,$00, $06,$00,$00, $00,$00
|
|
.byte $00,$06,$00,$00, $06,$00,$06,$00, $06,$00,$06,$00, $00,$00
|
|
.byte $06,$00,$00, $00,$06,$00,$00, $06,$00,$00, $06,$00,$06,$00, $00,$00
|
|
.byte $00,$06,$00, $06,$00,$00, $06,$00,$00, $06,$00,$00,$06,$00, $00,$00
|
|
.byte $00,$00,$06,$00, $06,$00,$06,$00, $06,$00,$06,$00
|
|
.byte $00,$00,$06,$00, $06,$00,$06,$00, $00,$00
|
|
.byte $06,$00,$00, $06,$00,$06,$00, $06,$00,$06,$00, $06,$00,$00, $00,$04,$00
|
|
.byte $00,$01,$61,$61,$61,$01,$00,$00
|
|
.byte $0,$0,$00,$01,$11,$41,$44,$44, $44,$42,$22,$42,$44,$44, $44,$42,$22,$02,$00,$00
|
|
.byte $0,$0,$01,$61,$61,$61,$01,$0
|
|
|
|
.repeat 64
|
|
.byte $0
|
|
.endrep
|
|
|
|
|
|
; ?
|
|
|
|
|
|
; Apple
|
|
;.byte $0,$0,$00,$C0,$C0,$CC,$C0,$0
|
|
;.byte $0,$0,$29,$29,$29,$29,$20,$0
|
|
;.byte $0,$0,$D0,$D0,$DC,$D0,$00,$0
|
|
;.byte $0,$0,$01,$61,$61,$61,$01,$0
|
|
|
|
; VMW Logo
|
|
;.byte $0,$0,$11,$11,$11,$11,$11,$44, $22,$22,$22,$22,$22,$44, $22,$22,$22,$22,$22,$00
|
|
;.byte $0,$0,$00,$01,$11,$41,$44,$44, $44,$42,$22,$42,$44,$44, $44,$42,$22,$02,$00,$00
|
|
;.byte $0,$0,$01,$11,$11,$11,$41,$44, $42,$22,$22,$22,$42,$44, $42,$22,$22,$22,$02,$00
|
|
;.byte $0,$0,$00,$01,$11,$41,$44,$44, $44,$42,$22,$42,$44,$44, $44,$42,$22,$02,$00,$00
|
|
|
|
|
|
gr_offsets:
|
|
.word $400,$480,$500,$580,$600,$680,$700,$780
|
|
.word $428,$4a8,$528,$5a8,$628,$6a8,$728,$7a8
|
|
.word $450,$4d0,$550,$5d0,$650,$6d0,$750,$7d0
|