Intel 80x86 ISA

• Long history

• Binary compatibility

• 1978: 8086, 16-bit, registers have dedicated uses

• 1980: 8087, added floating point (stack)

• 1982: 80286, 24-bit

• 1985: 80386, 32-bit, new insts -> GPR almost

• 1989-95: 80486, Pentium, Pentium II

• 1997: Added MMX

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