2400 BPS Internal Modem  (250-1037)    Interrupts      Faxback Doc. # 4697

SELECTING AN INTERRUPT

Most computers allow two interrupts, IRQ 3 and IRQ 4, to identify the
interrupts associated with a COM port.  The computer comes preset to choose
IRQ 3 (which is the typical interrupt chosen to work with COM 2) by having
the shorting connector on CN6.  If you want to select IRQ 4, change the
connector position as shown below.

If you communications software allows you to select an interrupt, be sure
to select the same interrupt as you set with CN5 and CN6.

┌──────────────────────────────────────────────┐
│Selecting the Interrupt Signal                │
├──────────────────┬─────────────┬─────────────┤
│Selected Interupt │    IRQ3     │    IRQ4     │
│Signal            │  (default)  │             │
├──────────────────┼─────────────┼─────────────┤
│Shorting          │  CN5   CN6  │  CN5   CN6  │
│Connector         │      ┌───┐  │ ┌───┐       │
│Position          │   *  │ * │  │ │ * │   *   │
│                  │      │   │  │ │   │       │
│                  │   *  │ * │  │ │ * │   *   │
│                  │      └───┘  │ └───┘       │
└──────────────────┴─────────────┴─────────────┘


(smc-09/14/93)