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Chapter 1 25
Memory Address Map
Memory Address Size Function
00000000-0009FFFF 640 KB Base memory
000A0000-000BFFFF 128 KB Video memory
000C0000-000CBFFF 40 KB Video BIOS
000E0000-000FFFFF 128 KB System BIOS
00100000-top limited
04000000-04000FFF
04001000-04001FFF
80100000-801000FF
80500000-805FFFFF
80800000-80BFFFFF
81000000-81FFFFFF
82100000-82100FFF
--
4 KB
4 KB
256 B
1 MB
3 MB
16 MB
4 MB
Extended (DIMM) memory
PCMCIA controller (slot 1)
PCMCIA controller (slot 2)
Lucent Win Modem
NetMagic VGA
Neomagic VGA
FFFF0000-FFFFFFFF 64 KB System board extension for PnP BIOS
I/O Address Map
I/O Address Function
000-00F DMA controller-1
020-021 Interrupt controller-1
040-043 Timer 1
060, 064 Keyboard controller 8742 chip select
061 System speaker out
040B DMA controller-1
061 System speaker
070-071 Real-time clock and NMI mask
080-08F DMA page register
0A0-0A1 Interrupt controller-2
0C0-0DF DMA controller-2
0F0-0FF Numeric data processor
120-13F, 180-18F Power management controller
170-177 2nd EIDE device (CD-ROM) select
1F0-1F7 1st EIDE device (hard drive) select
220-22F Audio
240-24F Audio(optional)
278-27F Parallel port 3
2E8-2EF LT Win modem or COM4 (optional)
2F8-2FF COM2 or LT Win modem(optional)
378, 37A Parallel port 2
3BC-3BE Parallel port 1
3B0-3BB, 3C0-3DF Video Controller
3F0h-3F7 Standard Floppy Disk Controller
3E8-3EF COM3 or LT Win modem (optional)
3F0-3F7 Floppy disk controller
3F8-3FF COM1 or LT Win modem (optional)
480-48F, 4D6 DMA controller-1
4D0-4D1, CF8-CFF PCI configuration register
505-1.book Page 25 Thursday, November 4, 1999 4:36 PM