X-Hacker.org- Programmers Reference 0.02b - int 0fh (15) (irq 7) lpt 1 printer, cluster (alternate)

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INT 0Fh (15) (IRQ 7)     LPT 1 Printer, Cluster (alternate)

      Printer Controller (called by hardware 8259-1, IRQ 7)
      Cluster Adapter (alternate)

         This interrupt is often avoided.
         If a bad interrupt occurs, it will vector to this spot
         (when caused a misprogramed 8259 interrupt controller)

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