2009-03-21 06:40:53 +00:00
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; utility routine to copy memory
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2009-01-22 01:27:03 +00:00
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.export copymem
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.exportzp copy_src
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.exportzp copy_dest
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.segment "IP65ZP" : zeropage
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; pointers for copying
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copy_src: .res 2 ; source pointer
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copy_dest: .res 2 ; destination pointer
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.bss
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end: .res 1
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.code
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2009-03-21 06:40:53 +00:00
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;copy memory
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;inputs:
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; copy_src is address of buffer to copy from
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; copy_dest is address of buffer to copy to
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; AX = number of bytes to copy
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;outputs: none
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2009-01-22 01:27:03 +00:00
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copymem:
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sta end
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ldy #0
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cpx #0
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beq @tail
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: lda (copy_src),y
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sta (copy_dest),y
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iny
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bne :-
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inc copy_src+1 ;next page
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inc copy_dest+1 ;next page
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dex
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bne :-
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@tail:
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lda end
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beq @done
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: lda (copy_src),y
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sta (copy_dest),y
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iny
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cpy end
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bne :-
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@done:
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rts
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