3-36 Software Environment and Extensions
AMD-K5 Processor Technical Reference Manual 18524C/0—Nov1996
3.3.7 Illegal Instruction (Reserved Opcode)
mnemonic opcode description
(none) 0FFF Illegal instruction (reserved opcode)
Privilege: Any level
Registers Affected: none
Flags Affected: none
Exceptions Generated: Real, Virtual-8086 mode—Invalid opcode
Protected mode—Invalid opcode
Protected mode—Invalid opcode
This opcode always generates an invalid opcode exception. The opcode will not be
used in future AMD K86™ processors.
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