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HP OmniBook 900
Product Information
1-7
System Resources
The tables in this section show typical resource usage as set up by the OmniBook BIOS. Plug-and-
play operating systems, drivers, and BIOS Setup settings may change some of the entries.
To see other, non-default possibilities, use the BIOS Setup utility (see page 3-24), which lists port and
audio device configurations in the System Devices menu.
Table 1-7. System Interrupts
0
System timer
1
Keyboard
2
Cascade IRQ 9
3
Free (or COM2 infrared port, if enabled)
4
COM1 (serial port)
5
Audio
6
Floppy drive
7
LPT1 (ECP parallel port)
8
Real-time clock
9
Free (OmniBook 900B)
Video (OmniBook 900†)
10
USB and CardBus - assigned by Windows driver
Video Controller (OmniBook 900B)
11
Free
12
Pointing device
13
Numeric data processor
14
Internal hard disk (primary IDE controller)
15
Internal CD-ROM drive (secondary IDE controller)
†
Models called 900† in this manual have no marking in the serial number,
whereas models called 900B have 900 B after the serial number.
Table 1-8. System Memory
00000 - 9FFFF
System memory
A0000 - BFFFF
Video
C0000 - CBFFF
C0000 - CFFFF
Video BIOS (OmniBook 900†)
Video BIOS (OmniBook 900B)
CC000 - DBFFF*
D0000 - DBFFF*
Free** (OmniBook 900†)
Free** (OmniBook 900B)
DC000*- FFFFF
System BIOS
*
Approximate boundary.
** Valid uses for memory addresses CC000-DBFFF or D0000-DBFFF:
Upper memory blocks (UMBs).
PC card memory windows.
† Models called 900† in this manual have no marking in the serial number,
whereas models called 900B have 900 B after the serial number.