FISUB             Integer Subtract            Exception Flags: I D O P

FISUB memory operand

       Logic:      ST . ST - memory operand

     FISUB subtracts two integers (ST - memory operand) and leaves the
     result in the stack top. The memory operand must be a word or short
     integer. The destination implied in the instruction is always ST.

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   Operands            Clocks         Bytes           Example
   FISUB               102-143+EA       5             FISUB INTEGER5
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