Int 3C  - Floating Point Emulation - Instructions With Segment Override    [r]


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:

See Also: INT 3B,INT 3D