On an 8086 possibilities are:
1. x'66' crashes due to invalid opcode.
2. x'66' behaves as a noop.
3. x'66' acts as an alias to some other instruction,
e.g. x'56' or x'76', in the same way that x'82' was,
until 2000, an alias for x'80'.
Which of these is it?
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