INT 3C - FLOATING POINT EMULATION - INSTRUCTIONS WITH SEGMENT OVERRIDE
Notes:  the floating-point emulators in Borland and Microsoft languages and
          Lahey FORTRAN use this interrupt
        the generated code is  CD 3C xy mm ....
          where xy is a modified ESC instruction and mm is the modR/M byte.
          The xy byte appears to be encoded as
                s s 0 1 1 x x x   or    s s 0 0 0 x x x
          where "ss" specifies the segment override:
                00 -> DS:
                01 -> SS:
                10 -> CS:
                11 -> ES:
SeeAlso: INT 3D