System Memory; System Memory Map - NEC POWERMATE V Service Manual

The Flash ROM allows the system and video BIOS to be upgraded with the BIOS Update
utility, without removing the ROM (see Section 2 for further information on the BIOS
Update utility). The Flash ROM supports the reprogramming of the system BIOS and the
video BIOS.
The system memory map is provided in Table 1-4.
Memory Space
00000000-0009FFFF
000A0000-000BFFFF
000C0000-000C7FFF
000C8000-000EFFFF
000F0000-000FFFFF
00100000-00EFFFFF
00F00000-00FFFFFF
01000000-03FFFFFF
04000000-07FFFFFF
FFF80000-FFFFFFFF

System Memory

Non-multimedia systems come standard with 8 MB of memory: 640 KB of base memory
and 7 MB of extended memory. All multimedia, 1.2 GB, and 1.6 GB hard disk
configurations come standard with 16 MB of memory: 640 KB of base memory and 15 MB
of extended memory. System memory can be expanded up to 128 MB, using optional single
in-line memory modules (SIMMs) installed in SIMM sockets on the system board.
Four SIMM sockets are integrated on the system board. Non-multimedia systems ship with
two 4-MB SIMMs (8 MB total) installed in two sockets. The multimedia, 1.2 GB, and 1.6
GB hard disk configurations ship with two 8-MB SIMMs (16 MB total) installed in two
sockets.
The SIMM memory sockets accept 32-bit (non-parity) 4-, 8-, 16-, or 32-MB 70 ns SIMMs.
The SIMMs are 1 MB x 32 bit (4 MB), 2 MB x 32 bit (8 MB), 4 MB x 32 bit (16 MB), and
8 MB x 32 bit (32 MB). When the standard SIMMs are removed, four 32-MB SIMMs may
be installed for a total of 128 MB.
Table 1-4 System Memory Map
Size
640 KB
128 KB
32 KB
160 KB
64 KB
14 MB
1 MB
48 MB
64 MB
512 KB
CAUTION: SIMMs must match the tin metal
plating used on the system board SIMM sockets.
When adding SIMMs, use tin-plated SIMMs.
Technical Information
Function
Conventional base memory
Video buffer
Video BIOS
Expansion
System BIOS
Cacheable
Optional memory space
Always cacheable
L1 cache only
BIOS ROM
1-9