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)
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INT 07H: Math Coprocessor Not Present