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102 lines
1.5 KiB
ArmAsm
102 lines
1.5 KiB
ArmAsm
; Entropy
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; by Dave McKellar of Toronto
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; Two-line BASIC program
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; Found on Beagle Brother's Apple Mechanic Disk
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; Converted to 6502 Assembly by Vince Weaver
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; 24001 ROT=0:FOR I=1 TO 15: READ A,B: POKE A,B: NEXT: DATA
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; 232,252,233,29,7676,1,7678,4,7679,0,7680,18,7681,63,
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; 7682,36,7683,36,7684,45,7685,45,7686,54,7687,54,7688,63,
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; 7689,0
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; 24002 FOR I=1 TO 99: HGR2: FOR E=.08 TO .15 STEP .01:
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; FOR Y=4 to 189 STEP 6: FOR X=4 to 278 STEP 6:
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; SCALE=(RND(1)<E)*RND(1)*E*20+1: XDRAW 1 AT X,Y:
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; NEXT: NEXT: NEXT
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; zero page locations
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HGR_SHAPE = $1A
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HGR_SCALE = $E7
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HGR_ROTATION = $F9
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XPOS = $FD
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XPOSH = $FE
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YPOS = $FF
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; ROM calls
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HGR2 = $F3D8
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HPOSN = $F411
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XDRAW0 = $F65D
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entropy:
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lda #<shape_table
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sta HGR_SHAPE
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lda #>shape_table
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sta HGR_SHAPE+1
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loop:
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jsr HGR2 ; HGR2
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eloop: ; FOR E=.08 TO .15 STEP .01:
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lda #4
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sta YPOS
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yloop: ; FOR Y=4 to 189 STEP 6
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lda #4
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sta XPOS
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lda #0
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sta XPOSH
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xloop: ; FOR X=4 to 278 STEP 6
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lda #1
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sta HGR_SCALE
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; SCALE=(RND(1)<E)*RND(1)*E*20+1
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ldy XPOSH
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ldx XPOS
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lda YPOS
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jsr HPOSN ; X= (y,x) Y=(a)
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ldx #<shape_table
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ldy #>shape_table
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lda #0 ; ROT=0
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jsr XDRAW0 ; XDRAW 1 AT X,Y
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; NEXT X
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lda XPOS
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clc
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adc #6
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sta XPOS
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lda #0
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adc XPOSH
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sta XPOSH
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beq xloop
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lda XPOS
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cmp #22
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bcc xloop
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nexty:
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; NEXT Y
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lda YPOS
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clc
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adc #6
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sta YPOS
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cmp #189
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bcc yloop
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; NEXT E
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jmp loop
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shape_table:
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; .byte 1,0 ; 1 shape
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; .byte 4,0 ; offset at 4 bytes
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.byte 18,63,36,36,45,45,54,54,63,0 ; data
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