HP OmniBook 7100 Reference Manual page 121

Valid uses for memory addresses D0000-DBFFF:
• Upper memory blocks (UMBs).
• PC Card memory windows.
System Input/Output Addresses (100-3FF)
170-177 Internal CD-ROM drive (secondary IDE controller)
1F0-1F7 Internal hard disk (primary IDE controller)
220-22F Audio
376 Internal CD-ROM drive (secondary IDE controller)
378-37F LPT1 (printer port)
388-38B Audio
3B0-3BB VGA adapter
3C0-3DF VGA adapter
3E0-3E1 PCMCIA controller
3F0-3F5 Floppy controller
3F6 Internal hard disk (primary IDE controller)
3F7 Floppy controller
3F8-3FF COM1 (serial port)
DMA Channels
0 Sound record (OmniBook 7100 only)
1 Sound playback
2 Floppy drive
3 LPT1 (ECP parallel port)
4 Cascade
5 Free
6 Free
7 Free
Specifications and Regulatory Information
Software System Resources
8-7