System Memory - NEC POWERMATE P60D Service Manual

1-8 Technical Information
Address (Hex)
0376
0377
0378-037F
03BC-03BF
03C0-03CF
03E8-03EF
03F0-03F5
03F6
03F7 (write)
03F7, bit 7
03F7, bits 6:0
03F8-03FF
0CF8
0CF9
C000-C0FF
C200-C2FF
C300-C3FF

System Memory

The system comes standard with 8-MB of memory. System memory can be expanded up to
80 MB for the desktop system and up 136 MB for the minitower system. Memory expan-
sion is performed using single in-line memory modules (SIMMs) installed in SIMM sockets.
The standard 8 MB of memory is soldered on the system board. The first megabyte includes
the standard 640 KB of base memory. The remaining memory is extended memory. Four
SIMM sockets are integrated on the system board.
The SIMM memory sockets accept 1-, 2-, 4-, 8-, 16-, or 32-MB SIMM sticks. High-speed
RAM is 32 bits wide with four parity bits. SIMMs are 256 K x 36 bit (1 MB), 512 K x 36
bit (2 MB), 1 M x 36 bit (4 MB), 4 M x 36 bit (16 MB), and 8 M x 36 bit (32 MB). There
are no switches or jumpers to set when SIMMs are added.
Table Section 1-5 I/O Address Map
I/O Device Name
Secondary IDE channel command port
Secondary IDE channel status port
Parallel port 1
Parallel port 2
Video Graphics Array (VGA) compare registers
Serial port 3
Diskette channel 1
Primary IDE channel command port
Diskette channel command port
Diskette change channel 1
Primary IDE channel status port
Asynchronous communications port 1
PCI Configuration Space Enable
Deturbo Mode Enable
82434LX configuration registers
82378IB configuration registers
Cirrus Video configuration registers