105 Appendix B
B.23 Interrupt Assignments
B.24 1st MB Memory Map
Table B.23: Interrupt Assignments
Interrupt # Interrupt assignments
0 (ISA) System timer
1 (ISA) Standard 101/102 key or Microsoft Natural PS/2
3 (ISA) Communications port (COM2)
4 (ISA) Communications port (COM1)
6 (ISA) Standard floppy disk controller
8 (ISA) System CMOS/real time clock
9 (ISA) Microsoft ACPI-compliant system
12 (ISA) PS/2 compatible mouse
13 (ISA) Numeric data processor
14 (ISA) Primary IDE channel
11 (PCI) Standard OpenHCD USB host controller
21 (PCI) Intel® PRO/100+ Server adapter (PILA8470B) #2
22 (PCI) Intel® PRO/100+ Server adapter (PILA8470B)
Table B.24: 1st MB memory map
Addr. range (HEX) Device
F0000h - FFFFFh System ROM
C8000h - EFFFFh Unused
C0000h - C7FFFh VGA BIOS
B8000h - BFFFFh CGA/EGA/VGA text
B0000h - B7FFFh Unused
A0000h - AFFFFh EGA/VGA graphics
00000h - 9FFFFh6 Base memory
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