Digital Equipment STARION 20 Series, Руководство по техническому обслуживанию

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Digital STARION 9xx & 20xx PC Device Mapping
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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.
NOTE Plug and Play add-in cards are automatically configured by the computers BIOS.
The ICU must be run to properly configure computer resources for use with legacy
ISA cards (that is, not Plug and Play ISA), in order to avoid conflicts with Plug and
Play cards.
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 Function Notes
0 KB to 640 KB main memory PC compatibility range
640 KB to 1024 KB
(1MB) main memory PC compatibility range
ISA memory lower limit
1MB to 16 MB
main memory ISA memory upper limit
16 MB to 128 MB main memory Computer memory upper limit