40 lines
1.1 KiB
ArmAsm
40 lines
1.1 KiB
ArmAsm
;=========================================================
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; gr_copy_to_page1, 40x48 version
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;=========================================================
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; copy $2000 to $400, careful to avoid screen holes
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gr_copy_to_page1:
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ldy #119 ; for early ones, copy 120 bytes ; 2
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gr_copy_line:
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lda $2000,Y ; load a byte (self modified) ; 4
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sta $400,Y ; store a byte (self modified) ; 5
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lda $2080,Y ; load a byte (self modified) ; 4
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sta $480,Y ; store a byte (self modified) ; 5
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lda $2100,Y ; load a byte (self modified) ; 4
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sta $500,Y ; store a byte (self modified) ; 5
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lda $2180,Y ; load a byte (self modified) ; 4
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sta $580,Y ; store a byte (self modified) ; 5
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lda $2200,Y ; load a byte (self modified) ; 4
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sta $600,Y ; store a byte (self modified) ; 5
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lda $2280,Y ; load a byte (self modified) ; 4
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sta $680,Y ; store a byte (self modified) ; 5
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lda $2300,Y ; load a byte (self modified) ; 4
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sta $700,Y ; store a byte (self modified) ; 5
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lda $2380,Y ; load a byte (self modified) ; 4
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sta $780,Y ; store a byte (self modified) ; 5
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dey ; decrement pointer ; 2
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bpl gr_copy_line ; ; 2nt/3
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rts ; 6
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