Digital PRIORIS XL Server
Digital PRIORIS XL Server
Device Mapping
Device Mapping
MCS Logistics Engineering - Nijmegen
MCS Logistics Engineering - Nijmegen
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Chapter 5
Device Mapping
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 i486,DX2 CPUs)
Range
Function
Notes
0 KB to 512 KB
Main memory
PC compatibility range
512 KB to 1024 KB
Main memory
PC compatibility range (EIAS/ISA memory lower
limit)
1 MB to 16 MB
Main memory
Memory space gap
EISA/ISA memory upper limit
PCI memory hole (4 MB max size)
(1)
16 MB to 128 MB
Main memory
i486, DX2/66 upper limit
128 MB to 4 GB
PCI memory
(1)
16 MB for PRIORIS XL Server
