Intergraph InterServe 9000 System Reference Manual page 23

System memory begins at address 0 and is continuous (flat addressing) up to the maximum amount
of DRAM installed (exception: system memory is noncontiguous in the ranges defined as memory
holes using configuration registers). The system supports both base (conventional) and extended
memory.
Base memory is located at addresses 00000h to 9FFFFh (the first 1 MB).
Extended memory begins at address 0100000h (1 MB) and extends to FFFFFFFFh (4 GB),
which is the limit of supported addressable memory. The top of physical memory is a
maximum of 4 GB (to FFFFFFFFh).
NOTE
The InterServe 9000 system is configured to support 4 GB of addressable
memory.
Some operating systems and application programs use base memory while others use both
conventional and extended memory. Examples:
Base memory: MS-DOS, OS/2, Windows NT, and UNIX
Conventional and extended memory: OS/2, Windows NT, and UNIX
MS-DOS does not use extended memory; however, some MS-DOS utility programs like RAM
disks, disk caches, print spoolers, and windowing environments use extended memory for better
performance.
The basic input/output system (BIOS) automatically detects, sizes, and initializes the memory
array, depending on the type, size, and speed of the installed DIMMs, and reports memory size and
allocation to the system via configuration registers.
In a 4 GB configuration, a small part of memory (typically 32 MB) is not remapped above 4 GB.
If your operating system does not support more than 4 GB of physical memory, this small part of
the memory is effectively lost.
NOTE
DIMM sizes and compatibility: Use DIMMs that have been tested for
compatibility with the baseboard. Contact your sales representative or dealer
for a list of approved DIMMs. The table below lists some sample size
combinations.
Table 4. Sample DIMM Component Combinations
Bank A (slots J1 - 4) Bank B (slots J5 - 8)
4x32
4x32 4x32
4x32 4x32
4x64 4x64
4x128 4x128
Bank C Bank D
(slots J9 - 12) (slots J13 - 16)
4x32 4x32
4x64 4x64
4x128 4x128
Total Memory
128 MB
256 MB
512 MB
1024 MB
2048 MB
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