x86 Opcode OIO

Opcode OIO

CPU: Cyrix Cx6x86 (same code on AMD Am5k86)

Logical Form: OIO

Description:
Caused #UD exception

Flags Affected: No Flags Affected
CPU Mode : RM,PM,VM,VME,SMM

Exceptions :
RM PM V86 VME SMM
#UD #UD #UD #UD #UD Undefined Instruction
No more Exceptions

Note :
This instruction caused #UD. AMD guaranteed that in future AMD's
CPUs this instruction will caused #UD. Of course all previous CPUs
(186+) caused #UD on this opcode. This instruction used by software
writers for testing #UD exception servise routine.

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Physical Form : UD

COP (Code of Operation) : 0Fh FFh

Clocks : UD
8088: Not supported
80186: ~int
80286: ~int
80386: ~int
Cx486SLC: ~int
i486: ~int
Cx486DX: ~int
Cx5x86: ~int
Pentium: ~int
Nx5x86: ~int
Cx6x86: ~int
Am5k86: ~int
Pentium Pro: ~int

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