67 lines
987 B
ArmAsm
67 lines
987 B
ArmAsm
; spinning dsr logo
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dsr_spin:
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ldy #$0
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sty FRAME ; 2
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sty OUR_ROT ; 2
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iny ; 1 ; set shape table scale to 1
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sty HGR_SCALE ; 2
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;=========================================
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; MAIN LOOP
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;=========================================
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main_loop:
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; increment FRAME
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inc FRAME ; 2
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;=======================
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; xdraw
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;=======================
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xdraw:
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; setup X and Y co-ords
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ldy #0 ; XPOSH always 0 for us
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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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jsr fast_hclr
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ldx #<shape_dsr ; point to our shape
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ldy #>shape_dsr ; code fits in one page so this doesn't change
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lda OUR_ROT ; set rotation
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jsr XDRAW0 ; XDRAW 1 AT X,Y
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jsr flip_page
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lda FRAME
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lsr
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bcc skip_bigger
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inc HGR_SCALE ; 2 ; increment scale
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skip_bigger:
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inc OUR_ROT ; 2
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inc OUR_ROT ; 2
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lda FRAME
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cmp #33 ; 2
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bcc main_loop ; 2
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ldx #10
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long_wait:
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lda #200
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jsr WAIT
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dex
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bne long_wait
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; rts
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;shape_dsr:
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;.byte $2d,$36,$ff,$3f
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;.byte $24,$ad,$22,$24,$94,$21,$2c,$4d
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;.byte $91,$3f,$36,$00
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