Ampro MightyBoard 821, Reference Manual

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Chapter 3 Hardware
16 Reference Manual MightyBoard 821
Interrupt Channel Assignments
The interrupt channel assignments are shown in Table 3-1 .
Legend: D = Default, O = Optional
Memory Map
The following table provides the common PC/AT memory allocations. These are DOS-level addresses. The
OS typically hides these physical addresses by way of memory management. Memory below 000500h is
used by the BIOS.
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 O D
COM2 D O
COM3 O D
COM4 D O
Parallel O D
RTC D
IDE D O
Math Coprocessor D
PS/2 Mouse D
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
Sound Blaster D O O O
USB Automatically Assigned
VGA Automatically Assigned
Ethernet Automatically Assigned
NOTE
The IRQs for the Ethernet, Video, and Internal LPC bus are automatically
assigned by the BIOS Plug and Play logic. Local IRQs assigned during
initialization can not be used by external devices.