02541.pdf

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MMPC Model 10/20
(250-1640/41)
Interrupts
Faxback Doc. # 2541
Interrupt Assignments
┌──────────────────────────────────────┬─────────┬────────────┐
│Device/Circuit
│Interrupt│Status
│
├──────────────────────────────────────┼─────────┼────────────┤
│8254
counter timer
│IRQ0
│Unavailable │
│PS/2
keyboard
│IRQ1
│Unavailable │
│Secondary
interrupt controller cascade│IRQ2
│Unavailable │
│Serial
port (COM2)
│IRQ3
│Reserved
│
│Serial
port (COM1)
│IRQ4
│Reserved
│
│Alternate
parallel port
│IRQ5
│Available
│
│Diskette
drive interface
│IRQ6
│Reserved
│
│Parallel
port and audio adapter
│IRQ7
│Reserved
│
│Real-time
clock
│IRQ8
│Reserved
│
│Video
vertical retrace (optional)
│IRQ9
│Available
│
│Alternate
serial port (COM4)
│IRQ10
│Available
│
│CD-ROM
drive interrupt
│IRQ11
│Unavailable │
│PS/2
mouse interrupt
│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-02/02/94)

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