DELL 100-Mbps User Manual

System Overview

1-15

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 

Generated by device connected to primary EIDE port to indicate 
that device requires service. If no EIDE devices are installed, this 
line is available for other use.

IRQ15

Generated by device connected to secondary EIDE port to indi-
cate that device requires service. If no device is connected to 
secondary EIDE port, IRQ15 is available for use by expansion 
card.

DREQ0

Available

DREQ1

Available

DREQ2

Generated by super I/O controller to initiate DMA cycle for 
attached diskette drive

DREQ3

Available

DREQ4

Generated by bus controller chip to activate second DMA con-
troller

DREQ5

Available (default) DMA on-board sound controller

DREQ6

Available

DREQ7

Available

Table 1-3.  Interrupt Assignments (continued)