69 lines
1.2 KiB
ArmAsm
69 lines
1.2 KiB
ArmAsm
.include "zp.inc"
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;================================
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; Clear screen and setup graphics
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;================================
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jsr clear_screens ; clear top/bottom of page 0/1
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jsr set_gr_page0
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;===============
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; Init Variables
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;===============
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lda #0
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sta DISP_PAGE
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;=======================
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; decompress scroll text
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;=======================
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lda #0
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sta CV
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sta ANGLE
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lda #>sky_background
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sta INH
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lda #<sky_background
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sta INL
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jsr decompress_scroll
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scroll_forever:
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jsr scroll_background
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jsr page_flip ; 6
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; lda #250
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; jsr WAIT
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jsr wait_until_keypressed
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inc ANGLE
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lda ANGLE
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and #$0f
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sta ANGLE
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jmp scroll_forever
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;===============================================
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; Routines
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;===============================================
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.include "../asm_routines/gr_fast_clear.s"
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.include "../asm_routines/gr_scroll.s"
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.include "../asm_routines/pageflip.s"
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.include "../asm_routines/gr_setpage.s"
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.include "../asm_routines/keypress.s"
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.include "../asm_routines/bg_scroll.s"
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.include "../asm_routines/gr_offsets.s"
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;===============================================
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; Variables
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;===============================================
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.include "starry_sky.scroll"
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