3100  (250-1632)         Interrupt Assignments         Faxback Doc. # 5515

┌─────────────────────────────────┬─────────────┬─────────────────┐
│Device/Circuit                   │  Interrupt  │  Status         │
├─────────────────────────────────┼─────────────┼─────────────────┤
│8254 Counter timer               │  IRQ0       │ Unavailable     │
│PS/2 keyboard                    │  IRQ1       │ Unavailable     │
│Secondary interrupt controller   │  IRQ2       │ Unavailable     │
│   cascade                       │             │                 │
│Serial port (COM2)               │  IRQ3       │ Reserved        │
│Serial port (COM1)               │  IRQ4       │ Reserved        │
│Alternate parallel port          │  IRQ5       │ Available       │
│Diskette drive interface         │  IRQ6       │ Reserved        │
│Parallel port                    │  IRQ7       │ Reserved        │
│Real-time clock                  │  IRQ8       │ Reserved        │
│Video vertical retrace (optional)│  IRQ9       │ Available       │
│Alternate serial port (COM4)     │  IRQ10      │ Available       │
│Alternate serial port (COM3)     │  IRQ11      │ Available       │
│PS/2 mouse interface             │  IRQ12      │ Reserved        │
│Coprocessor                      │  IRQ13      │ Unavailable     │
│IDE hard drive interface         │  IRQ14      │ Reserved        │
│Unused                           │  IRQ15      │ Available       │
└─────────────────────────────────┴─────────────┴─────────────────┘
Status key:

Unavailable = Used internally; cannot be freed.

Available = Unused in system with default configuration.

Reserved = Used in system with default configuration; can be freed by
           changing jumper or software settings.

(smc-01/04/94)