The x86 architecture has a long and convoluted history dating back to 1978, when Intel announced the 16-bit 8086 microprocessor. IBM selected the 8086 and its cousin, the 8088, for IBM’s first personal computer
The 8086 microprocessor provided eight 16-bit registers. It could separately access the upper and lower eight bits of some of these registers. When the 32-bit 80386 was introduced, the registers were extended to 32 bits. These registers are called EAX, ECX, EDX, EBX, ESP, EBP, ESI, and...
X86 has become the common term used to describe a CPU instruction set compatible with the Intel 8086 and its successors. The x86 lineage began in 1978 with the 16-bit 8086 microprocessor. They are known as CISC - Complex Instruction Set Computing - processors. Unlike RISC, CISC instructions...
Two of the best known families of microprocessor are those based on the Motorola 68000 and Intel 8086 architectures, the 680脳0 family gaining popularity through its association with the Apple Macintosh and the 80脳86 family through association with the original IBM PC. By adopting this family ...
Two of the best known families of microprocessor are those based on the Motorola 68000 and Intel 8086 architectures, the 680x0 family gaining notoriety through its association with the Apple Macintosh and the 80x86 family through association with the IBM PC. By adopting this family approach, firs...
a CD-ROM device, or a flash memory device. Mass storage device 104 provides information to external memory 102. Processor 104 can be a microprocessor and is capable of decoding and executing a computer program such as an application program or operating system with instructions from multiple instr...
instructionsetarchitecture
The String Instruction in 8086 are namely, REP is a prefix which is written before one of the string instructions. These instructions repeat
Most of the opcodes in 8086 has a special 1-bit indicates. They are : W-bit :Some instructions of 8086 can operate on byte or a word. The W-bit in the opcode of such instruction specify whether instruction is a byte instruction (W = 0) or a word instruction (W = 1). ...
2. Description of the Relevant Art Microprocessor manufacturers continue to develop new products which execute ×86 instructions in order to maintain compatibility with the vast amount of software developed for previous 80×86 generations--the 8086/8, 80286, 80386, and 80486. Maintaining software com...