Key Instructions in the 8086 Instruction Set
The Intel 8086 microprocessor has a wealthy coaching set architecture (ISA) with loads of commands catering to different responsibilities.
Here are some key instructions in the 8086 instruction set along side information on their capability and utilization:
MOV (Move)
- Syntax: MOV destination, supply
- Description: The MOV preparation transfers statistics from a supply operand to a destination operand. The source and destination operands may be registers, memory places, or instantaneous values.
- Example: MOV AX, BX – Moves the contents of sign in BX into sign up AX.
ADD (Addition)
- Syntax: ADD destination, supply
- Description: The ADD instruction adds the source operand to the destination operand and shops the bring about the vacation spot operand.
- Example: ADD AX, BX – Adds the contents of register BX to register AX and shops the result in sign up AX.
SUB (Subtraction)
- Syntax: SUB destination, supply
- Description: The SUB preparation subtracts the source operand from the destination operand and shops the bring about the vacation spot operand.
- Example: SUB AX, BX – Subtracts the contents of register BX from register AX and stores the result in sign up AX.
INC (Increment)
- Syntax: INC operand
- Description: The INC instruction increments the value of the operand by using one.
- Example: INC AX – Increments the fee of register AX via one.
DEC (Decrement)
- Syntax: DEC operand
- Description: The DEC coaching decrements the fee of the operand by using one.
- Example: DEC AX – Decrements the value of register AX via one.
CMP (Compare)
- Syntax: CMP operand1, operand2
- Description: The CMP training plays a subtraction among operand1 and operand2, but it does now not save the result. It only updates the flags sign up primarily based on the result of the comparison.
- Example: CMP AX, BX – Compares the content.
PUSH
- PUSH stores the value from a register or memory location in the top of a stack. It is used to pass parameters to subroutines or store the registers’ values.
- The code implicates a transition of the AX register data to the stack. Following the stacking, the stack pointer is decremented to point to the new top of the stack.
POP
- POP instruction carries out the operation of storing the topmost value of the stack into a register, a memory location or a stack. In this case, it serves for bringing the last values already applied to the stack.
- This instruction is used to pop the highest value from the stack and load it into the AX register. Upon completion, the value that was formerly pushed onto the stack is transferred into AX, while the stack pointer (SP) is increased to point to the new top of the stack
POPA
- Instruction POPA knocks values out of stack frame in a defined order and puts them into general-purpose registers. It isn’t the counterpart of the PUSHA command.
- This indicates deserving values from stack to registers (DI, SI, BP upward to AX) using the stack system. Next, EAX, ECX, and EDX registers are holding the original value that has been saved onto the stack in the opposite order.
PUSHA
- The PUSHA instruction of the pushes the values of general-purpose registers to the stack in that order. Saving temporary register values before the subroutine changes and restoring them later is also a part of it.
- This instruction loads values into the stack from AX and upwards, including CX, DX, and ending with DI. Following every register write, the corresponding value is pushed on the stack and the stack pointer (SP) is decremented.
8086 Instruction Set
The 8086 instruction set is key to understanding the Intel 80 coding pattern and its significant significance as a path-making chip among x patterns. Unveiled in 1978, it brought innovation into computing by having the ability to provide better overall performance and memory attributes than earlier devices. This article investigates the details behind the 8086 instruction set as well its additives of it in matters of class, addressing modes key command and assembly language programming extensions complexes regarding challenges and further advantages.
Table of Content
- 8086 Instruction Set
- Classification of Instructions set
- Addressing Modes
- Key Instructions in the 8086 Instruction Set
- Assembly Language Programming with the 8086
- 8086 Instruction Set Extensions
- FAQs on 8086 Instruction Set