FISUBR            Integer Subtract Reversed   Exception Flags: I D O P

FISUBR memory operand

       Logic:      ST . memory operand - ST

     FISUBR subtracts two integers (memory operand - ST) 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 ST.

     This instruction is the reversed form of FISUB, which subtracts memory
     operand from ST (ST - memory operand).

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   Operands            Clocks         Bytes           Example
   FISUBR              103-144+EA       5             FISUBR INTEGER5
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