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18 Chapter 1
Note : UPPER LIMIT means the maximum size of installed memory.
The Main Memory Maximum size are 768M Bytes.
Memory Address Map
Address Size Function
000000 - 07FFFF 512KBytes Host Memory
080000 - 09FFFF 128KBytes Host/PCI Memory
0A0000 - 0BFFFF 128KBytes PCI/ISA Video Buffer Memory
0C0000 - 0C7FFF 32KBytes Video BIOS Memory
0C8000 - 0DFFFF 96KBytes ISA Card BIOS & Buffer Memory
0E0000 - 0EFFFF 64KBytes BIOS Extension Memory
Setup and Post Memory
PCI Development BIOS
0F0000 - 0FFFFF 64KBytes System BIOS Memory
100000 - UPPER LIMIT Main Memory
UPPER LIMIT - 4GBytes PCI Memory
Onboard Device ID & IRQ Map
Device AD# IDSEL Route Reg. Mask
Intel 845 MCH AD11 00h
P2P AD30 13h
(Func.0) ICH2 (LPC) AD31 14h
(Func.1) ICH2 (IDE) AD31 14h
(Func.2) ICH2 (USB) AD31 14h 68h FFh
(Func.3) ICH2 (SMBUS) AD31 14h
(Func.5) ICH2 (AC97 Audio) AD31 14h 61h FFh
PCI Slot 1 AD16 05h 60h FFh
PCI Slot 2 AD17 06h 61h FFh
PCI Slot 3 AD21 07h 62h FFh
PCI Slot IRQ Routing Map
PCI INTX# INTA INTB INTC INTD
PCI 1 Route 1 Route 2 Route 3 Route 4
PCI 2 Route 2 Route 3 Route 4 Route 1
PCI 3 Route 3 Route 4 Route 1 Route 2