FBSTP           Store BCD and pop                    Exceptions: I
                                                     C3 C2 C1 C0: ? ? * ?
FBSTP destination

        Logic   destination ← ST
                pop ST

    FBSTP converts the value in ST into a packed decimal integer (BCD),
    and stores the result at the specified memory destination. It then
    pops the stack.
    If ST contains a non-integral value, FBSTP rounds it according to
    the RC field of the control word.


    Opcode      Format
    DF /6       FBSTP m80


    Timing
    Operand       8087         287        387      486     Pentium
    m80        (520-540)+EA  520-540    512-534  172-176   148-154 NP