macro LDIR,source,dest,count
;LoaD, Increment, Repeat
lda #<source
sta $00
lda #>source
sta $01

lda #<dest
sta $02
lda #>dest
sta $03

ldx count
ldy #0
\@:         ;this is a local label

lda ($00),y ;load a byte from the source address
sta ($02),y ;store in destination address
iny         ;increment
dex
bne \@      ;repeat until x=0
endm