Specifications

Chapter 3 Hardware
18 Reference Manual LittleBoard 800
Interrupt Channel Assignments
The interrupt channel assignments are shown in Table 3-1.
Legend: D = Default, O = Optional
NOTE ADLINK Technology, Inc. only supports the features/options tested and listed in
this manual. The main integrated circuits (chips) used in the LittleBoard 800
may provide more features or options than are listed for the LittleBoard 800, but
some of these chip features/options are not supported on the board and may not
function as specified in the chip documentation.
This chapter does not include pinout tables for standard headers and connectors
such as PC/104, Ethernet RJ45, 40-pin IDE, Floppy, and Compact Flash.
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 D
Keyboard D
Secondary Cascade D
COM1 ODOOO OO O O O O
COM2 DOOOO OO O O O O
COM3 OOOOO OO D O O O
COM4 OOOOO OD O O O O
Floppy D
Parallel OOOOD OO O O O O
RTC D
IDE Primary D
IDE Secondary D
Math Coprocessor D
PS/2 Mouse D
PCI INTA OODOO OO O O O O
PCI INTB OOOOO DO O O O O
PCI INTC OODOO OO O O O O
PCI INTD OOOOO DO O O O O
PCI INTE OODOO OO O O O O
PCI INTF OOOOO DO O O O O
PCI INTH OODOO OO O O O O
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.