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8086 instruction set opcodes. ) and values instead of their 16-bit (ax, bx, etc.
8086 instruction set opcodes. This is indicated by two numbers separated by "/". It lists the opcode and operands for over 50 common instructions such as ADD, CALL, CMP, DEC, IMUL, JMP, MOV, POP, PUSH, and RET. (The map is split in half; columns 0-7 appear in the first part, while columns 8-F appear in the second. [2] These instructions are also available in 32-bit mode, in which they operate on 32-bit registers (eax, ebx, etc. ) Below is the full 8086 / 8088 instruction set of Intel (81 instructions total). ? - flag value is undefined (maybe 1 or 0). This document provides an overview of the instruction set and opcodes for the 8086 microprocessor. Sep 20, 2024 ยท The 8086 instruction set is a group of commands that the Intel 8086 microprocessor uses to perform tasks. This is especially important for Conditional Jump instructions (see " Program Flow Control " in Tutorials for more information). ) counterparts. ) and values instead of their 16-bit (ax, bx, etc. Some instructions generate exactly the same machine code, so disassembler may have a problem decoding to your original code. 1 - instruction sets this flag to 1. It includes a variety of instructions that allow developers to create software for many different tasks, from simple math to more complex processing. r - flag value depends on result of the instruction. To use the map, find the cell in the row labelled with the opcode's most significant 4 bits, and the column labelled with the opcode's least significant 4 bits. The higher number (on the left side of "/") means duration of instruction when action is taken, the lower number (on the right side of "/") means duration of instruction when action is not taken. 0 - instruction sets this flag to 0. . ucdzrwevritxgywpjbvakdboceckawqwfscqhxhnnokikmkdju