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Table 4-2 DMA Channels
Controller
Channel
Address
Function
1
0
0087
Spare
1
1
0083
Spare
1
2
0081
Diskette
1
3
0082
Spare
2
4
Cascade
Cascade
2
5
008B
Spare
2
6
0089
Spare
2
7
008A
Spare
Table 4-3 IRQ Interrupt Levels
Priority
Interrupt
Number
Interrupt Source
1
SMI
Power management unit
2
NMI
Parity Error Detected,,I/O Channel Error
3
IRQ0
Interval Timer,,Counter 0 Output
4
IRQ1
Keyboard
IRQ 2
Interrupt from controller 2 (cascade)
5
IRQ8
Real Time Clock
6
IRQ 9
Cascaded to INT 0AH (IRQ 2)
7
IRQ10
Reserved
8
IRQ
11,Reserved
9
IRQ 12,PS/2 Mouse
10
IRQ13
INT from Coprocessor
11
IRQ14
Hard Disk Controller
12
IRQ15
Reserved
13 IRQ3
Serial Comm
Port 2
14
IRQ4
Serial Comm Port 1
15
IRQ5
Reserved
16
IRQ6
Diskette Controller
17
IRQ7
Parallel Port
4-4
Theory
Summary of Contents for Extensa 450 Series
Page 1: ...Maintenance Manual Extensatm 450 Series Notebook Computers 9805725 0001 November 1995 ...
Page 12: ...Figure 1 2 Extensa 450 Series Features 1 4 General Description ...
Page 42: ...Figure 4 1 Notebook Functional Block Diagram 4 2 Theory ...
Page 71: ...Figure 6 5 Touchpad Removal Replacement 6 12 Field Service ...
Page 93: ...Connector Pinouts B 11 ...
Page 100: ...Printed in U S A ...