Digital PRIORIS ZX Server
Pass / Fail Criteria
MCS Logistics Engineering - Nijmegen
85
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.
Memory Map
Address Range (hex)
Amount
Function
0000_0000–0003_FFFF
256 KB
Base server memory (fixed)
0004_0000–0007_FFFF
256 KB
Base server memory (fixed)
0008_0000–0009_FFFF
128 KB
Base server memory or ISA
memory
enabled in Setup
000A_0000–000B_FFFF
128 KB
ISA video frame buffer
000C_0000–000E_FFFF
192 KB
Expansion board video BIOS (can
be shadowed) AIC-7870 SCSI
BIOS (can be shadowed)
000F_0000–000F_FFFF
64 KB
ISA memory, server BIOS (fixed)
0010_0000–00EF_FFFF
14 MB
Server memory or unused
00F0_0000–00FF_FFFF
1 MB
Server memory or EISA/ISA
memory
0100_0000–3FFF_FFFF
1 008 MB
Server memory or unused
4000_0000–BFFF_FFFF
1 024 MB
EISA memory or I/O slave
memory
