Specifications

Chapter 3 Hardware
ReadyBoard 800 Reference Manual 23
Interrupt Channel Assignments
The channel interrupt assignments are listed in Table 3-1.
Table 3-1. Interrupt Channel Assignments (Typical)
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
O D O O
COM2
D O O O
COM3
O O O D
COM4
O O D O
Floppy
D
Parallel
O D
RTC
D
IDE Primary
D O
IDE Secondary
O D
Math Coprocessor
D
PS/2 Mouse
D
Sound Blaster
D O O O
PCI INTA
Automatically Assigned
PCI INTB
Automatically Assigned
PCI INTC
Automatically Assigned
PCI INTD
Automatically Assigned
PCI INTE
Automatically Assigned
PCI INTF
Automatically Assigned
PCI INTH
Automatically Assigned
USB
Automatically Assigned
VGA
Automatically Assigned
Ethernet
Automatically Assigned
Legend: D = Default, O = Optional Refer also to the IRQs listed in Chapter 4, BIOS Setup.
NOTE The IRQs for the Ethernet, Video, and USB 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. Refer to Table 3-2.