XCHG - Swap Instruction

The XCHG instruction is used to swap the values of operand one with operand two.

This command has 3 parts, Instruction, then either a Register or a memory address.

Assembly
Sample Description 16 bit Machine
Code

XCHG AX, BX ; Swaps Register values 93

XCHG BX, AX ; Swaps Register values 93

XCHG CX, BX ; Swaps Register values 87 CB

XCHG BX, CX ; Swaps Register values 87 CB

XCHG AX, [BX] ; Swaps a Register with a memory address 87 07

XCHG [BX], AX ; Swaps a Register with a memory address 87 07

XCHG [BX+2], CX ; Swaps a Register with a memory address
; and offset 87 4F 02

Assembly Sample	Description	16 bit Machine Code
XCHG AX, BX	; Swaps Register values	93
XCHG BX, AX	; Swaps Register values	93
XCHG CX, BX	; Swaps Register values	87 CB
XCHG BX, CX	; Swaps Register values	87 CB
XCHG AX, [BX]	; Swaps a Register with a memory address	87 07
XCHG [BX], AX	; Swaps a Register with a memory address	87 07
XCHG [BX+2], CX	; Swaps a Register with a memory address ; and offset	87 4F 02