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60 lines
851 B
ArmAsm
60 lines
851 B
ArmAsm
; How does this work?
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; seems mostly to be using $0004 - $FF04 as a shape table
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; It's because we are passing ROT as the low byte of shape table
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; zero page locations
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HGR_SHAPE = $1A
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A5H = $45
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XREG = $46
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YREG = $47
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HGR_SCALE = $E7
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HGR_ROTATION = $F9
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FRAME = $FC
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XPOS = $FD
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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 ; shape table in Y:X
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RESTORE = $FF3F
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;.zeropage
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tiny_tiny:
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jsr HGR2 ; Hi-res graphics, no text at bottom
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; Y=0, A=0 after this call
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lda #1
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sta HGR_SCALE
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tiny_loop:
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; setup X and Y co-ords
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ldy #0 ; Y always 0
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ldx #140
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lda #96
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jsr HPOSN ; X= (y,x) Y=(a)
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ldx #$4
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rot_smc:
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lda #0 ; ROT=0
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pha
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and #$1f
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clc
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adc #208
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tay ; ldy #>shape_table
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pla
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zurg:
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jsr XDRAW0 ; XDRAW 1 AT X,Y
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; Both A and X are 0 at exit
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inc rot_smc+1
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jmp tiny_loop
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; d0..ff
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; 208 .. 255 = 48
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