Operating the OmniBook XE2 Software System Resources Valid uses for memory addresses D0000-DBFFF: • Upper memory blocks (UMBs). • PC Card memory windows. System Input/Output Addresses (100-3FF) DMA Channels 2-15 170-177 Secondary HDD controller (internal CD-ROM) 1F0-1F7 Internal hard disk 220-22F Audio for DOS programs 376 Secondary HDD controller (internal CD-ROM) 378-37F LPT1 (printer port) 388-38B Sound 3B0-3BB VGA adapter 3C0-3DF VGA adapter 3E0-3E1 PCMCIA controller 3F0-3F5 Floppy controller 3F6 Primary HDD controller 3F7 Floppy controller 3F8-3FF COM1 (serial port) 0 Sound record 1 Sound playback 2 Floppy drive 3 LPT1 (ECP parallel port) 4 Cascade 5 Free 6 Free 7 Free