PUSH - Stack Retrieval Instruction

The PUSH instructions are used to store the registers in the stack.

All other PUSH instructions save the register selected by the operand.

Stack items are retrieved using the POP instruction.

PUSH has 2 parts, the Instruction and an operand which can be either a Register, 16 bit immediate value, or a 16 bit memory address.

PUSHA has 1 part, the Instruction. It saves all the arithmetic Registers in the stack in the following sequence. AX, CX, DX, BX, SP, BP, SI, DI.

PUSHF has 1 part, the Instruction. It saves the Flags Register on the stack.

Instruction 16 bit Machine
Code

PUSHF 9C

PUSHA 60

PUSH AX 50

PUSH CX 51

PUSH DX 52

PUSH BX 53

PUSH SP 54

PUSH BP 55

PUSH SI 56

PUSH DI 57

PUSH ES 06

PUSH SS 16

PUSH CS 0E

PUSH DS 1E

PUSH FS 0F A0

PUSH GS 0F A8

PUSH 0x0303 68 03 00

PUSH [BX] FF 37

PUSH [BX+2] FF 77 02

Instruction	16 bit Machine Code
PUSHF	9C
PUSHA	60
PUSH AX	50
PUSH CX	51
PUSH DX	52
PUSH BX	53
PUSH SP	54
PUSH BP	55
PUSH SI	56
PUSH DI	57
PUSH ES	06
PUSH SS	16
PUSH CS	0E
PUSH DS	1E
PUSH FS	0F A0
PUSH GS	0F A8
PUSH 0x0303	68 03 00
PUSH [BX]	FF 37
PUSH [BX+2]	FF 77 02