Function:

Intended to communicate with NEC maths co-processors. The NEC "FPO1" opcode
corresponds to Intel's "ESC" prefix for co-processor instructions. Although
data sheets exist for NEC maths co-processors, they have never been
manufactured.

Note that the 386+ CPUs implement the opcodes 66 and 67 as Operand Size and
Address Size prefixes respectively.

(Supplied by Anthony Naggs)




HLT  Halt the processor
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