emu 8086
For assembly language programming, EMU8086 is a potent emulator and integrated development environment (IDE). It offers an easy-to-use platform that makes 8086 programming learning, coding, and debugging easier. EMU8086 is a feature-rich toolkit that makes it easy for developers to create, execute, and test assembly language programs. With the help of this emulator, which simulates actual hardware, programmers may simulate and run their code in a setting that closely resembles that of the original Intel 8086 CPU. With its user-friendly interface, debugger, and assembler, EMU8086 is a priceless tool for novice and expert programmers who are familiar with low-level coding and the complexities of x86 assembly language programming.
8086 Instruction Sets
The x86 architecture found in contemporary computers is derived from the instruction set design of the Intel 8086, a 16-bit microprocessor. Its instruction set consists of a variety of instructions that are arranged according to their functions:
1. Instructions for Data Transfer:
Data is moved between registers, memory regions, and immediate values with the MOV command.
XCHG: Switches two operands' contents.
Data can be pushed onto or popped off of a stack using the push/pop method.
LEA: Inserts the source operand's effective address into the destination operand.
2. Instructions in Arithmetic:
ADD, SUB, INC, DEC: Carry out operations related to addition, subtraction, increment, and decrement.
Execute signed and unsigned division and multiplication operations using MUL, IMUL, DIV, and IDIV.
ADC, SBB: Use carry for addition and borrow for subtraction.
3. Logical Instructions:
Carry out bitwise logical operations with AND, OR, XOR, and NOT.
TEST: Uses bitwise AND to operate on two operands without saving the outcome.
4. Instructions for Control Transfer:
JMP: Jump to a different place in the code unconditionally.
Call a subroutine and exit the procedure using the CALL/RET command.
Jcc: Conditional jump (e.g., JE for Jump if Equal) dependent on specific criteria.
5. Instructions for Strings:
Move words, bytes, or double words between locations within strings using MOVSB, MOVSW, and MOVSD.
Compare bytes, words, or double-words inside strings using CMPSB, CMPSW, and CMPSD.
Use SCASB, SCASW, and SCASD to search for bytes, words, or double words in a string.
6. Instructions for Flag Control:
CLC, STC, CLI, STI: Disable or enable interrupts; clear or set the carry flag.
CMC: Enhance the carry signal.
7. Instructions for Input/Output:
I/O port read from the IN port.
Write to an I/O port using OUT.
8. Miscellaneous Instructions:
NOP: No action (makes no difference).
HLT: Stop the CPU and wait for an interrupt.
Wait for memory or the coprocessor.
INT: Produce an interruption in software.
1. Instructions for Data Transfer:
Data is moved between registers, memory regions, and immediate values with the MOV command.
XCHG: Switches two operands' contents.
Data can be pushed onto or popped off of a stack using the push/pop method.
LEA: Inserts the source operand's effective address into the destination operand.
2. Instructions in Arithmetic:
ADD, SUB, INC, DEC: Carry out operations related to addition, subtraction, increment, and decrement.
Execute signed and unsigned division and multiplication operations using MUL, IMUL, DIV, and IDIV.
ADC, SBB: Use carry for addition and borrow for subtraction.
3. Logical Instructions:
Carry out bitwise logical operations with AND, OR, XOR, and NOT.
TEST: Uses bitwise AND to operate on two operands without saving the outcome.
4. Instructions for Control Transfer:
JMP: Jump to a different place in the code unconditionally.
Call a subroutine and exit the procedure using the CALL/RET command.
Jcc: Conditional jump (e.g., JE for Jump if Equal) dependent on specific criteria.
5. Instructions for Strings:
Move words, bytes, or double words between locations within strings using MOVSB, MOVSW, and MOVSD.
Compare bytes, words, or double-words inside strings using CMPSB, CMPSW, and CMPSD.
Use SCASB, SCASW, and SCASD to search for bytes, words, or double words in a string.
6. Instructions for Flag Control:
CLC, STC, CLI, STI: Disable or enable interrupts; clear or set the carry flag.
CMC: Enhance the carry signal.
7. Instructions for Input/Output:
I/O port read from the IN port.
Write to an I/O port using OUT.
8. Miscellaneous Instructions:
NOP: No action (makes no difference).
HLT: Stop the CPU and wait for an interrupt.
Wait for memory or the coprocessor.
INT: Produce an interruption in software.