System Memory - NEC POWERMATE PROFESSIONAL - SERVICE MANUAL 05-1997 Service Manual

1-10 Technical Information
Address (Hex)
03E8-03EF
03F0-03F5
03F6
03F7 (write)
03F7, bit 7
03F7, bit 6 through 0
03F8-03FF
04D0-04D1
LPT + 400h
0608-060B
0CF8*
0CF9
0CFC-0CFF*
FF00-FF07
FFA0-FFA7
0FF0-0FF7
* Only accessible by DWORD accesses.

System Memory

Configurations ship with 32 MB or 64 MB of memory: 640 KB of base memory and 31 MB
or 63 MB of extended memory. System memory can be expanded up to 256 MB using
optional single in-line memory modules (SIMMs) installed in SIMM sockets on the system
board.
The memory configuration consists of two banks (bank 0 and bank 1) with two sockets
each. The memory sockets accept 32-bit, 60-ns for faster, 4-, 8-, 16-, 32-, or 64-MB
SIMMs. The sockets accept Extended Data Out (EDO) mode or Fast Page (FM) mode
SIMMs and support parity, non-parity, or error checking and correction (ECC).
The SIMMs are 1 MB x 32 bit (4 MB), 2 MB x 32 bit (8 MB), 4 MB x 32 bit (16 MB),
8 MB x 32 bit (32 MB), and 16 MB x 32 bit (64 MB). When the standard SIMMs are
removed, four 64-MB SIMMs may be installed for a total of 256 MB.
Table 1-4 I/O Address Map
I/O Device Name
Serial port 3
Floppy channel 1
Primary IDE channel command port
Floppy channel 1 command
Floppy disk change channel 1
Primary IDE channel status port
Onboard serial port 1
Edge/level triggered
ECP port, LPT + 400h
Yamaha audio
PCI configuration address register
Turbo and reset control register
PCI configuration data register
IDE bus master register
IDE primary channel
Yamaha audio
CAUTION: SIMMs must match the tin metal
plating used on the system board SIMM sockets.
When adding SIMMs, use tin-plated SIMMs
only.