Specifications

Chapter 3 Hardware
CoreModule 720 Reference Manual 21
Interrupt Channel Assignments
The interrupt channel assignments are shown in Table 3-1.
Legend: D = Default, O = Optional, X = Fixed
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.
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
Secondary Cascade X
COM0 O D
COM1 D O
COM2 O D
COM3 O O D O
RTC X
Math Coprocessor X
PCI INTA Automatically Assigned
PCI INTB Automatically Assigned
PCI INTC Automatically Assigned
PCI INTD Automatically Assigned
USB Automatically Assigned
Video Automatically Assigned
NOTE The IRQs for USB and Video are automatically assigned by the BIOS Plug and
Play logic. Local IRQs assigned during initialization can not be used by external
devices.
Table 3-2. Memory Map
Base Address Function
00000000h - 0009FFFFh Conventional Memory
000A0000h - 000AFFFFh Graphics Memory
000B0000h - 000B7FFFh Mono Text Memory
000B8000h - 000BFFFFh Color Text Memory
000C0000h - 000CFFFFh Standard Video BIOS
000D0000h - 000DFFFFh DVMT Memory
000E0000h - 000EFFFFh PCI Express Base Memory
000F0000h - 000FFFFFh System Flash and PCI Resources