mirror of
https://github.com/deater/dos33fsprogs.git
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87 lines
1.2 KiB
ArmAsm
87 lines
1.2 KiB
ArmAsm
; Sawblade
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; 32 bytes for Lovebyte2024
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; by Vince `deater` Weaver / DsR
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; zero page locations
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GBASL = $26
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GBASH = $27
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HGR_X = $E0
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HGR_X2 = $E1
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HGR_Y = $E2
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HGR_SCALE = $E7
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HGR_ROTATION = $E8
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; ROM locations
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HGR2 = $F3D8
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HPOSN = $F411
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XDRAW0 = $F65D
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XDRAW1 = $F661
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HPLOT0 = $F457
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sawblade:
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ldy #1 ; this 1 must be at #$E7
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jsr HGR2 ; Hi-res, full screen ; 3
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; Y=0, A=0 after this call
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; iny ; Y=1
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; sty HGR_SCALE
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; sty HGR_ROTATION
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; A and Y are 0 here.
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; X is left behind by the boot process?
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tiny_loop:
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; A is 0 both paths
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tay ; Y=0
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ldx #140
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lda #96
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jsr HPOSN ; set screen position to X= (y,x) Y=(a)
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; saves X,Y,A to zero page
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; after Y= orig X/7
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; A and X are ??
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ldx #<our_shape ; load shape table
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ldy #>our_shape ;
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inc HGR_ROTATION
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lda HGR_ROTATION
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and #$3f
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bne skip
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inc HGR_SCALE
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; rotation in A, $00b..$3F
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skip:
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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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; Z flag set on exit
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; Y varies
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beq tiny_loop ; bra
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our_shape = $E2E0
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; F0 03 20 00
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; 9 bytes + 4 bytes :(
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; ldx #4
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;loop:
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; lda blah,X
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; sta zp,X
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; dex
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; bne loop
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; 9 bytes
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; iny
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; sty HGR_SCALE
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; ldy #0
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; ldx #140
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; lda #96
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