mirror of
https://github.com/deater/dos33fsprogs.git
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75 lines
1.0 KiB
ArmAsm
75 lines
1.0 KiB
ArmAsm
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visualization:
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ldx #0
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vis_loop_outer:
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lda gr_offsets_l,X
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sta GBASL
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lda gr_offsets_h,X
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sta GBASH
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lda $70,X
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ldy #19
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vis_loop_inner:
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sta (GBASL),Y
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dey
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bne vis_loop_inner
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inx
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cpx #14
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bne vis_loop_outer
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ldx #0
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vis_loop_outer2:
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lda gr_offsets_l,X
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sta GBASL
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lda gr_offsets_h,X
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sta GBASH
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lda $80,X
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ldy #39
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vis_loop_inner2:
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sta (GBASL),Y
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dey
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cpy #20
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bne vis_loop_inner2
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inx
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cpx #14
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bne vis_loop_outer2
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lda #200
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jsr wait
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rts
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gr_offsets_l:
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.byte <$400,<$480,<$500,<$580,<$600,<$680,<$700,<$780
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.byte <$428,<$4a8,<$528,<$5a8,<$628,<$6a8,<$728,<$7a8
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.byte <$450,<$4d0,<$550,<$5d0,<$650,<$6d0,<$750,<$7d0
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gr_offsets_h:
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.byte >$400,>$480,>$500,>$580,>$600,>$680,>$700,>$780
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.byte >$428,>$4a8,>$528,>$5a8,>$628,>$6a8,>$728,>$7a8
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.byte >$450,>$4d0,>$550,>$5d0,>$650,>$6d0,>$750,>$7d0
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; copy of ROM wait
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; because we might disable ROM
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wait:
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sec
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wait2:
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pha
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wait3:
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sbc #$01
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bne wait3
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pla
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sbc #$01
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bne wait2
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rts
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wait_end:
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.assert (>wait_end - >wait) < 1 , error, "wait crosses page boundary"
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