Chapter 3 Hardware
ReadyBoard 700 Reference Manual 21
Interrupt Channel Assignments
The channel interrupt assignments are listed in Table 3-1.
Table 3-1. Interrupt Channel Assignments
Device vs IRQ No. 012345678910 11 12 13 14 15
Timer X
Keyboard X
Secondary
Cascade X
COM1 OD
COM2 DO
COM3 OO OD
COM4 OO DO
Floppy X
Parallel OD
RTC X
IDE Primary XO
IDE Secondary OX
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 DOOO
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.
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.