Appendix D Detailed system information 65
DMA Page Addresses
Page register
I/O Address
DMA Channel 0
0087
DMA Channel 1
0083
DMA Channel 2
0081
DMA Channel 3
0082
DMA Channel 5
008B
DMA Channel 6
0089
DMA Channel 7
008A
Refresh
008F
Interrupt assignments
Priority
Interrupt#
Interrupt source
1
NMI
Parity error detected
2
IRQ 0
Interval timer, counter 0 output
3
IRQ 1
Keyboard
-
IRQ 2
Interrupt from controller 2 (cascade)
4
IRQ 8
Real-time clock
5
IRQ 9
Cascaded to INT 0AH (IRQ 2)
6
IRQ 10
Reserved
7
IRQ 11
Reserved
8
IRQ 12
Reserved
9
IRQ 13
INT from co-processor
10
IRQ 14
Fixed disk controller
11
IRQ 15
Reserved
12
IRQ 3
Serial communication port 2
13
IRQ 4
Serial communication port 1
14
IRQ 5
Parallel port 2 (bus mouse)
15
IRQ 6
Diskette controller (FDC)
16
IRQ 7
Parallel port 1 (print port)
Timer channel assignments
Channel Function
0
System timer
2
Refresh request generator
3
Tone generation for speaker
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