Explain x86-based CPUs?

Answer 1

The term x86 is a general label for the assembler for the 8086, 80186, 80386, 386DX and 486DX processors from Intel and second source fabricators, so the x represents the preceding digits in the family. The architecture of the CPU is closely based on a previous generation of hardware designs using the appropriate assembler. For the re-implements in microminiature forms for microcomputers, PC and notebooks, the assembler was redefined with different op code names but retaining the original constructs of instructions. Licences are required to operate x86 code on brands and models of computers, but not all models and architectures can support x86 and the code is not permitted in some countries. The x87 code relates to the math co-processor chip but is very similar to x86 but has the specific floating point instructions; these suffered from result variances and accuracy inherent in the hardware but this was overcome in recent years and is used for CPU processors of a different architecture found in newer netbooks and small laptops, for which a X86 licence is not relevant