Chapter 3
Hardware
LittleBoard 800
Reference Manual
23
Interrupt Channel Assignments
The channel interrupt assignments are shown in Table 3-1.
Table 3-1. Interrupt Channel Assignments
Device vs IRQ No.
0
1
2
3
4
5
6
7
8
9
10 11
12
13
14
15
Timer
X
Keyboard
X
Secondary
Cascade
X
COM1
O
O
D
O
O
O
O
O
O
O
O
O
COM2
O
D
O
O
O
O
O
O
O
O
O
O
COM3
O
O
O
O
O
O
O
O
D
O
O
O
COM4
O
O
O
O
O
O
O
D
O
O
O
O
Floppy
X
Parallel
O
O
O
O
O
D
O
O
O
O
O
O
RTC
X
IDE Primary
X
IDE Secondary
X
Math Coprocessor
X
PS/2 Mouse
X
PCI INTA
O
O
O
D
O
O
O
O
O
O
O
O
PCI INTB
O
O
O
O
O
O
D
O
O
O
O
O
PCI INTC
O
O
O
D
O
O
O
O
O
O
O
O
PCI INTD
O
O
O
O
O
O
D
O
O
O
O
O
PCI INTE
O
O
O
D
O
O
O
O
O
O
O
O
PCI INTF
O
O
O
O
O
O
D
O
O
O
O
O
PCI INTH
O
O
O
D
O
O
O
O
O
O
O
O
Legend:
D = Default, O = Optional, X = Fixed
NOTE
The IRQs for the Ethernet, Video, and Internal Local Bus (ISA) are
automatically assigned by the BIOS Plug and Play logic. Local IRQs
assigned during initialization can not be used by external devices.
Memory Map
The following table provides the common PC/AT memory allocations. Memory below 000500h is used
by the BIOS.
Summary of Contents for LittleBoard 800
Page 1: ...LittleBoard 800 Single Board Computer Reference Manual P N 5001743A Revision A...
Page 26: ...Chapter 2 Product Overview 20 Reference Manual LittleBoard 800...
Page 82: ...Chapter 4 BIOS Setup 76 Reference Manual LittleBoard 800...
Page 84: ...Appendix A Technical Support 78 Reference Manual LittleBoard 800...
Page 90: ...Appendix C Connector Part Numbers 84 Reference Manual LittleBoard 800...
Page 94: ...Index LittleBoard 800 Reference Manual 88...
Page 95: ......
Page 96: ......
