Chapter 5 Device Mapping; Cpu Memory Address Map (Full Range); Cpu I/O Address Map - Digital Equipment CELEBRIS Pentium PC Service Maintenance Manual

Digital CELEBRIS Pentium PC
Chapter 5
This section provides a series of tables listing mapping and address information related to computer
memory and various main logic board devices (keyboard controller, interrupt controller, DMA controller,
etc.).
The computer's memory and address locations are allocated at the factory to operate within a standard PC
environment. However, due to the number of optional devices and/or expansion boards that are available,
sometimes memory and address locations need to be changed. For example, some network expansion
boards require a specific memory location. If that location is already allocated, a memory conflict results
and the expansion board will not operate as expected. Note that some memory, I/O and interrupt locations
can be changed using the BIOS Setup utility.
CAUTION
Before changing any memory or address location, refer to the documentation supplied
with the optional device, expansion board, or software application and make sure
adequate information is available.

CPU Memory Address Map (Full Range)

Range
0 KB to 640 KB
640 KB to 1024 KB
1 MB to 16 MB
16 MB to 128 MB
64 MB to 4 GB
128 MB to 4 GB

CPU I/O Address Map

Range (hexadecimal)
0CF8 to 0CFF
1000 to FFFF
MCS Logistics Engineering - Nijmegen
Function
Main memory
Main memory
Main memory
Memory space gap
Main memory
PCI memory
PCI memory
Function
PCI configuration space enable registers
PCI I/O space
Device Mapping
Notes
PC compatibility range
PC compatibility range (ISA memory lower limit)
ISA memory upper limit
Computer memory upper limit
Only Venturis 560 Series
Only Venturis FP400 Series
Device Mapping
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