NEC VERSA P, Service Manual

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1-6 Technical Information
SYSTEM MEMORY
The system board provides 8 MB of standard random access memory (RAM) with 16 KB
internal cache, and 256 KB external cache. Base memory is 640 KB and extended memory
is 7168 KB (interleaved). The system does not support memory remap.
Optional memory cards with a value of 4-, 8-, 12-, 16-MB or 32-MB can be added to in-
crease system memory. Additionally, 256 KB of read-only memory (ROM), 1 x 28F020,
enables the system BIOS to be flashed.
The system supports the following RAM configurations using optional memory cards:
n
standard RAM plus an optional 4-MB memory card for a total of 12-MB RAM
n
standard RAM plus an optional 8-MB memory card for a total of 16-MB RAM
n
standard RAM plus an optional 12-MB memory card for a total of 20-MB RAM
n
standard RAM plus an optional 16-MB memory card for a total of 24-MB RAM
n
standard RAM plus an optional 32-MB memory card for a total of 40-MB RAM.
Memory Map
The system supports system and video shadowing, both controlled through complementary
metal oxide semiconductor (CMOS). The system supports BIOS as a cacheable area with
write protection. Table Section 1-1 lists the system's memory map.
Table Section 1-1 Versa System Memory Map
Memory Space Size Function
000000-09FFFF 640 KB Reserved for System Base Memory
0C0000-0C7FFF
32 KB
Mapped to ISA BIOS
0C8000-0CFFFF
32 KB
Mapped to ISA Bus
0D0000-0DFFFF
64 KB
Mapped to PCMCIA Bus
0E0000-0FFFFF
1
28 KB
Reserved for System BIOS
E8000h-EFFFFFh
64KB
Reserved for System BIOS
100000h-On-Board

Reserved for Extended and/or Expanded system
memory