System Memory - NEC POWERMATE P - SERVICE MANUAL 1996 Service And Reference Manual

Address (Hex)
0000-000F
0020-0021
0040-0043
0048-004B
3F8-3FF
CF8-CFF

System Memory

All systems come standard with 16 MB of EDO 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. The multimedia and 1.2-/2.0-GB
hard disk configurations ship with two 2 MB x 32 SIMMs) (16 MB total) installed in two
sockets.
The SIMM memory sockets accept 32-bit (non-parity) 4-, 8-, 16-, or 32-MB 60 ns or 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.
SIMMs install directly in the four sockets on the system board. The four sockets are
assigned as SIMM 1 through SIMM 4. The two standard 8 MB SIMMs are installed in
SIMM 1 and SIMM 2. SIMMs must be installed in pairs of the same memory type. Jumpers
are not required to set memory size or type as the system BIOS automatically detects the
SIMMs. SIMM banks 1 and 2 must always be filled for the system to operate. Table 1-4
shows the SIMM memory upgrade path.
Table 1-3 I/O Address Map
I/O Device Name
DMA controller 1 (channel 0-3)
Interrupt controller 1
Timer 1
Timer 2
Serial port 1
PCI configuration space
CAUTION: SIMMs must match the tin metal
plating used on the system board SIMM sockets.
When adding SIMMs, use tin-plated SIMMs.
Technical Information 1-9