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132 Reference Guide
System Memory
00000 - 9FFFF System memory
A0000 - BFFFF Video
C0000 - CBFFF
C0000 - CFFFF
Video BIOS (unmarked models***)
Video BIOS (“900 B” models***)
CC000 – DBFFF*
D0000 – DBFFF*
Free** (unmarked models***)
Free** (“900 B” models***)
DC000*- FFFFF System BIOS
* Approximate boundary.
** Valid uses for memory addresses CC000-DBFFF or D0000-DBFFF:
Upper memory blocks (UMBs).
PC card memory windows.
*** Unmarked models have no “900” after the serial number, “900 B” models have “900 B”
after the serial number.
System Input/Output Addresses (100-3FF)
120-127 Audio (only models without “900” after serial
number)
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 Video adapter
3C0-3DF Video adapter
3E0-3E1 PCMCIA controller
3F0-3F5 Floppy controller
3F6 Internal hard disk (primary IDE controller)
3F7 Floppy controller
3F8-3FF COM1 (serial port)