Interrupt Map; Memory Map; Interrupts - Intel 440BX Manual

The CY2318NZ clock buffer is used to buffer the clock signals sent to the SDRAM DIMMS. The
SDRAM interface operates at 66 or 100 MHz.
3.2.22

Interrupt Map

Table 2. Interrupts
IRQ
NMI
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
3.2.23

Memory Map

Table 3. Memory Map
Address Range
(Hex)
100000-8000000
E0000-FFFFF
C8000-DFFFF
A0000-C7FFF
9FC00-9FFFF
80000-9FBFF
00000-7FFFF
®
Intel 440Bx Scalable Performance Board Development Kit Manual
System Resources
I/O Channel Check
Reserved, Interval Timer
Reserved, Keyboard buffer full
Reserved, Cascade interrupt from slave PIC
Serial Port 2
Serial Port 1
Parallel Port (PNP0 option)
Floppy
Parallel Port 1
Real Time Clock
IRQ2 Redirect
Reserved. Not supported.
Reserved. Not supported.
Onboard Mouse Port if present, else user available
Reserved, Math coprocessor
Primary IDE if present, else user available
Reserved. Not supported.
Size
127.25M Extended Memory
128K BIOS
Available expansion BIOS area (Flash disk memory window)
Off-board video memory and BIOS
1K Extended BIOS Data (movable by QEMM, 386MAX)
127K Extended conventional
512K Conventional
Theory of Operation
Description
25