INT 0fH is a hardware-generated interrupt (IRQ 7) forced by LPT1 when it
is ready to receive a character (but only when the printer controller has
been programmed to generate the interrupt).

  CPU Exception Interrupt  
286+ computer execute INT 0dH when the CPU is in protected mode and it
detects any memory access outside of the areas available to a task.

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INT 0dH: IRQ 5 LPT2 / General Protection Fault