Ampro Corporation Littleboard 550 Manuel D’Utilisation
Chapter 3
Hardware
LittleBoard 550
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
Cascade
X
COM1
O D
COM2
D O
COM3
O O
O D
COM4
O O
D O
Floppy
X
Parallel
O
D
RTC
X
IDE Primary
X
O
IDE Secondary
O
X
Math Coprocessor
X
PS/2 Mouse
X
PCI INTA
Automatically Assigned
PCI INTB
Automatically Assigned
PCI INTC
Automatically Assigned
PCI INTD
Automatically Assigned
Sound Blaster
D
O
O O
USB
Automatically Assigned
VGA
Automatically Assigned
Ethernet
Automatically Assigned
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.
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.
by the BIOS.