Int 75  - IRQ13 - Math Coprocessor Exception (at And Up)                   [H]

   redirected to INT 02 by the BIOS, for compatibility with the PC

Notes: may be masked by setting bit 5 on I/O port A1h
   not all clones wire the coprocessor to generate this IRQ; some systems
     generate an NMI (see INT 02) or assert the -ERROR pin on the CPU
     (see INT 10"COPROCESSOR")
   under DESQview, only the INT 15h vector and BASIC segment address (the
     word at 0000h:0510h) may be assumed to be valid for the handler's
     process

See Also: INT 10"COPROCESSOR",INT 5D