instructions n1 n2 -> n2 n1 SWP -> Swaps byte n2 with n1 on the stack. SWPw -> Swaps word n2 with n1 on the stack. SWPx -> Swaps byte x with n1 on the stack. SWPxw -> Swaps word xw with n1 on the stack. SWPy -> Swaps byte y with n1 on the stack. SWPyw -> Swaps word yw with n1 on the stack. SWAPxy -> Swaps bytes x with y. SWAPxyw -> Swaps word xw with yw.