Chapter 3
Hardware
20
Reference Manual
CoreModule 420
Interrupt Channel Assignments
The channel interrupt assignments are shown in Table 3-2.
Table 3-2. Interrupt Channel Assignments
Device vs
IRQ No.
0
1
2
3
4
5
6
7
8
9
10 11
12
13
14
15
Disable
Timer
X
Keyboard
X
Secondary
Cascade
X
COM1
D
Z
COM2
D
Z
COM3
O
O
O
O
O
O
O
O
D
O
O
Z
COM4
O
O
O
O
O
O
O
D
O
O
O
Z
Floppy
D
Z
Parallel
O
O
O
O
O
D
O
O
O
O
Z
RTC
X
Prim. IDE
D
Z
Sec. IDE
D
Z
USB
O
O
O
O
O
O
O
O
O
D
O
Z
Ethernet
O
O
O
D
O
O
O
O
O
O
O
Z
Math
Coprocessor
X
PS/2 Mouse
O
O
O
O
O
O
O
O
O
D
Z
Legend:
D = Default, O = Optional, X = Fixed, Z = Disable option
NOTE
The devices listed with a “Z” in the Disable column indicate the device
can be disabled, which will free the IRQ for another device in the list.
Table 3-3. DMA Map
DMA #
Use
0-1, 5, 6, 7
2
Floppy (configurable)
3
LPT 1, only in ECP mode (configurable)
4
DMA 1 cascade
I/O Address Map
Table 3-4. I/O Address Map
Address (hex)
Subsystem
0000-000F
Primary DMA Controller (#1)
0020-0021
Master Interrupt Controller (#1)
0022-0023
STPC Configuration
Summary of Contents for CoreModule 420
Page 1: ...CoreModule 420 PC 104 Single Board Computer Reference Manual P N 5001692A Revision A ...
Page 6: ...Contents vi Reference Manual CoreModule 420 ...
Page 10: ...Chapter 1 About this Manual 4 Reference Manual CoreModule 420 ...
Page 22: ...Chapter 2 Product Overview 16 Reference Manual CoreModule 420 ...
Page 50: ...Chapter 3 Hardware 44 Reference Manual CoreModule 420 ...
Page 64: ...Appendix A Technical Support 58 Reference Manual CoreModule 420 ...
Page 66: ...Appendix B Connector Part Numbers 60 Reference Manual CoreModule 420 ...
Page 70: ...Index 64 Reference Manual CoreModule 420 ...
Page 71: ......
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