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IRQ Number: 13
16-Bit Priority: 8
Bus Line: No
Typical Default Use: Floating point unit (FPU / NPU / Math coprocessor).
Other Common Uses: None; for system use only.
Description: This is the reserved interrupt for the integrated floating point unit (on 80486 or later machines) or the math coprocessor (on 80386 or earlier machines that use one). It is used exclusively for internal signaling and is never available for use by peripherals.
Conflicts: This is a dedicated interrupt line; there should never be any conflicts. If software indicates a conflict on this IRQ, there is a good possibility of a hardware problem somewhere on your system board, or possibly with your processor or math coprocessor.