source equ $10            ;$10 was chosen arbitrarily
source_hi equ source+1    ;the high byte MUST be after the low byte, otherwise this will not work.
dest equ $12
dest_hi equ dest+1

LDA #<MyString ;get the low byte of &MyString
STA source
LDA #>MyString ;get the high byte
STA source_hi  ;we just created a "shallow reference" to an existing string.
               ;As it turns out, this is a necessary step to do a deep copy.

LDA #<RamBuffer
STA dest
LDA #>RamBuffer
STA dest_hi


strcpy:
;assumes that RamBuffer is big enough to hold the source string, and that the memory ranges do not overlap.
;if you've ever wondered why C's strcpy is considered "unsafe", this is why.

LDY #0
.again:
LDA (source),y
STA (dest),y
BEQ .done
INY
BNE .again   ;exit after 256 bytes copied or the null terminator is reached, whichever occurs first.
RTS


MyString:
byte "hello",0
RamBuffer:
byte 0,0,0,0,0,0