Appendix C.

IRQ

and DMA-Channel Assignments

 

 

 

 

 

 

 

This

appendix

lists the interrupt-request (IRQ) and

direct-memory-acc

(DMA)-channel

assignments

for

your system unit

for the

Model

140

and

 

Note:

If

you

install ISA adapters in your

Model

140

or

Model

240

 

 

sure that no interrupts or DMA channels conflict

with

existing

r

 

example,

do not

set

an

ISA adapter

to use

interrupt

(IRQ)

6

 

used

by

the diskette

drive.

 

 

 

 

 

 

 

IRQ Assignments

The following table shows the interrupt-request assignments.

IRQ

Description

 

 

 

 

 

 

 

 

 

 

0

Interval

timer

 

 

1

Keyboard

 

 

 

 

2

Cascade from controller 2 (Not available)

3

Serial

port

2

 

 

4

Serial

port

1

 

 

5

Available for ISA bus if not used for audio

6

Diskette

drive

 

7

Parallel port 1 or Audio

8

Real-time

clock

 

 

9

Available

for

ISA

bus

10

Available

for

ISA

bus

11

Available

for

ISA

bus

12

Available

for ISA bus if not used for mouse

13

Scatter

 

Gather

 

14

Available

for

ISA

bus

15

Available

for

ISA

bus if not used for tablet port

 

 

 

 

 

 

 

Copyright IBM Corp. 1996, 1998

C-1

Page 307
Image 307
IBM RS/6000 7043 43P manual DMA-Channel Assignments, IRQ Assignments, Appendix C, Irq