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49 lines
895 B
ArmAsm
49 lines
895 B
ArmAsm
; 16B wavy pattern
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; zero page locations
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GBASL = $26
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GBASH = $27
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HGR_SCALE = $E7
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HGR_COLLISIONS = $EA
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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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wavy16:
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; we load at zero page $E7 which is HGR_SCALE
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; this means the scale is $20 (JSR)
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jsr HGR2 ; Hi-res, full screen ; 3
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; Y=0, A=0 after this call
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; A and Y are 0 here.
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; X is left behind by the boot process?
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; set GBASL/GBASH
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; we really have to call this, otherwise it won't run
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; on some real hardware depending on setup of zero page at boot
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jsr HPOSN ; set screen position to X= (y,x) Y=(a)
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; saves X,Y,A to zero page
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; after Y= orig X/7
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; A and X are ??
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tiny_loop:
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lda #$F3 ; ROT=F3 (mod 64?)
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tay
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tax
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dex
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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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