![]() Here, 32 bit means that all registers, memory bus, and data bus are 32 bit. With the introduction of 80386, the x86 instruction was extended to a 32bit system. Since all these processors end with the number 86, the instruction set architecture was identified by the name x86. Then later they introduced various processors such as 80186, 80286, 8036, and all were backward compatible with the original instruction set used in the 8086 processor. In 1978, Intel introduced the 8086 processor that was a 16 bit processor. X86 is an instruction set architecture introduced by Intel with the famous 8086 processor. Later other companies such as Intel also implemented that specification and this AMD64 is the one that is identified by the name 圆4. Then various extensions happened and, in 2000, AMD created the specification to extend the x86 instruction set to 64bit under the name AMD64. ![]() x86 is a world famous ISA introduced by Intel in 1978 with the 8086 processor. Instructions, memory addressing, registers, and many other architectural sections of a CPU are specified by the ISA. ![]() An instruction set architecture (ISA) is a very important term that applies to any CPU. The most important difference between x86 and 圆4 is that the former is the 32 bit architecture and the latter is the 64 bit instruction set architecture.
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