Chapter 1 13

Hardware Configuration and Specification

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 1 28 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

Interrupt Channel Assignment

Interrupt Channel Function
NMI System errors
IRQ0 System timer
IRQ1 Keyboard
IRQ2 Cascade
IRQ3 FIR or COM2
IRQ4 COM1
IRQ5 Audio or LPT2 (optional)
IRQ6 Floppy
IRQ7 LPT1
IRQ8 Real time clock
IRQ9 Card bus / ACPI o r Modem/ VGA
IRQ10 USB
IRQ11 Free or COM1
IRQ12 PS2 pointing devi ce
IRQ13 Numeric data processor
IRQ14 1st EIDE device (hard disk)
IRQ15 2nd EIDE device (CD-ROM drive)