Category:68000 Assembly: Difference between revisions

===Big-Endian===

The 68000, unlike most processors of its era, is big-endian. This means that bytes are stored from left to right. The example below illustrates this concept:

<lang 68000devpac>MOVE.L #$12345678,$100000 ;store the hexadecimal numeral #$12345678 at memory address $100000

;hexdump of $100000:

;$100000 = $12

;$100001 = $34

;$100002 = $56

;$100003 = $78</lang>

On a little-endian processor such as in [[x86 Assembly]], the order of the bytes would be reversed, i.e.:

<lang asm>;hexdump of $100000

;$100000 = $78

;$100001 = $56

;$100002 = $34

;$100003 = $12</lang>

This difference isn't usually relevant in the majority of situations, so don't concern yourself too much. It's much more important when doing [[6502 Assembly]] where registers are smaller than the address space.