Interrupt Assignments

 

Table 1-3. Interrupt Assignments

 

 

IRQ Line

Used By/Available

 

 

IRQ0

Generated by system timer.

IRQ1

Generated by keyboard controller to indicate that keyboard’s out-

 

put buffer is full.

IRQ2

Generated internally by interrupt controller to enable IRQ8

 

through IRQ15.

IRQ3

Generated by super I/O controller to indicate that device con-

and

nected to corresponding serial port requires service (IRQ3 for

IRQ4

COM2 or COM4; IRQ4 for COM1 or COM3).

IRQ5

Available for use by expansion card unless this IRQ line is used

 

by secondary parallel port.

IRQ6

Generated by super I/O controller to indicate that diskette or tape

 

drive requires service.

IRQ7

Generated by super I/O controller to indicate that device con-

 

nected to parallel port requires service.

IRQ8

Generated by keyboard controller for each tick of RTC.

IRQ9

Available for use by expansion card.

IRQ10

Available for use by expansion card.

IRQ11

Available for use by expansion card.

IRQ12

Generated by keyboard controller to indicate that mouse’s output

 

buffer is full.

IRQ13

Generated by math coprocessor to indicate coprocessor error.

IRQ14

Available for use.

IRQ15

Available for use.

 

 

System Overview 1-17

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Image 34
Dell 2100/180 service manual Interrupt Assignments

2100/180 specifications

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