INT 07H: Math Coprocessor Not Present

  INT 07H is executed automatically when any 80x87 Floating Point Opcodes
  are executed and no math chip is there to handle it.

  More generally, this takes place when an ESC or WAIT opcode is executed
  specifying a coprocessor that's not present.

  Math chip emulators intercept this interrupt to provide floating-point
  support (very slowly, I might add).

See Also: IRQs (hardware interrupts)
          ROM-BIOS Functions
          DOS Functions