Technical Information 1-19
SERIAL INTERFACE
The RS-232C serial port is a 9-pin connector on the system’s rear panel. The serial port
consists of a 16550A and 16450 compatible serial port controller with a programmable
baud rate up to 115,200 bps. The serial port connects an RS-232C device or an external
modem. The default serial port address is 3F8h and the interrupt level is IRQ04.
NEC VERSA CHIP SET
Refer to Table 1-3 for a quick summary of the chip types used in the system. See the Ab-
breviations section at the beginning of this manual for a translation of chip technologies.
Table 1-3
NEC Versa Series Chip Types and Technologies
Chip
Manufacturer
Description
Technology
Intel Pentium P55CLM
Intel
150 MHz CPU
320-pin TCP
82430MX PCI
Intel
M-Triton Data Path
Controller
100-pin QFP
82437MX (MTSC)
Intel
M-Triton System Controller
208-pin SQFP
82371MX (MPIIX)
Intel
M-PCI IDE ISA Xcelerator
176-pin TQFP
N28F020-150
Intel
256k x 8 Flash ROM
32-pin PLCC
C&T 65550A1
Chips &
Technologies
VGA Controller
208-pin FQFP
PC87338VJG
National
Semiconductor
Diskette Controller, IDE,
Parallel Interface
100-pin QFP
M38813E
Mitsubishi
Keyboard Controller
64-pin TQFP
PCI1130
Texas Instruments
PC Card Controller
208-pin VQFP
ViBRA CT2505 16C
Creative
Technology
Sound Controller
100-pin PQFP
Intel Pentium P55CLM Microprocessor
The 150 MHz Intel Pentium microprocessor used in the NEC Versa series computer is built
on Intel’s advanced 3.3V BiCMOS silicon technology. The CPU has on-chip dual-
processing, a local multiprocessor interrupt controller, and power management features.
NEC adopted the chip specifically for its pipelined Floating Point Unit (FPU), and local in-
terrupt management.
M-Triton System Controller
NEC implements Intel’s Mobile Triton technology for several of the notebook’s subsystems
including the DRAM controller, Second Level Cache Controller and PCI Bus interface. The
Mobile Triton PCIset features include:
