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https://github.com/deater/dos33fsprogs.git
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92 lines
1.1 KiB
ArmAsm
92 lines
1.1 KiB
ArmAsm
;==========================
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; check for earthquake
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earthquake_handler:
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lda FRAMEH
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and #3
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bne earth_mover
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lda FRAMEL
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cmp #$ff
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bne earth_mover
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earthquake_init:
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lda #200
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sta EQUAKE_PROGRESS
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lda #0
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sta BOULDER_Y
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jsr random16
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lda SEEDL
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and #$1f
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clc
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adc #4
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sta BOULDER_X
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earth_mover:
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lda EQUAKE_PROGRESS
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beq earth_still
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and #$8
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bne earth_calm
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lda #2
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bne earth_decrement
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earth_calm:
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lda #0
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earth_decrement:
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sta EARTH_OFFSET
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dec EQUAKE_PROGRESS
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jmp earth_done
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earth_still:
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lda #0
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sta EARTH_OFFSET
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earth_done:
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;================================
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; copy background to current page
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lda EARTH_OFFSET
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bne shake_shake
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no_shake:
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jsr gr_copy_to_current
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jmp done_shake
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shake_shake:
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jsr gr_copy_to_current_1000
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done_shake:
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rts
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;======================
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; draw falling boulders
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draw_boulder:
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lda BOULDER_Y
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cmp #38
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bpl no_boulder
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lda #<boulder
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sta INL
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lda #>boulder
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sta INH
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lda BOULDER_X
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sta XPOS
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lda BOULDER_Y
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sta YPOS
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jsr put_sprite
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lda FRAMEL
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and #$3
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bne no_boulder
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inc BOULDER_Y
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inc BOULDER_Y
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no_boulder:
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rts
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