Serial Interface; Nec Versa 4000 Series Chip Set; Intel Pentium P54Lm; Nec Versa 4000 Series Chip Types And Technologies - NEC VERSA 4000 Service Manual

1-12 Technical Information
The parallel port address is 378h and the interrupt level is IRQ07. Pin locations for the par-
allel interface are listed in Appendix A.

SERIAL INTERFACE

The RS-232C serial port is a 9-pin connector on the system's rear panel. The serial port
consists of a 16550 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 serial
port address is 3F8h and the interrupt level is IRQ04.

NEC VERSA 4000 SERIES CHIP SET

Refer to Table Section 1-5 for a quick summary of the chip types used in the system. See
the Abbreviations section at the beginning of this manual for a translation of chip technolo-
gies.
Table Section 1-5 NEC Versa 4000 Series Chip Types and Technologies
Chip

Intel Pentium P54LM

PT80C732 or
PT80C733
PT86C718
N28F020-150
C&T65545B1-5
PC87334
M38813E4HP
PD6722
ES688S
Intel Pentium P54LM
The 75 MHz, 90 MHz or 120 MHz Intel Pentium microprocessor used in the NEC Versa
4000 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 interrupt management.
Manufacturer Description
Intel 75 MHz, 90-MHz, 120-MHz
CPU
Pico Power Cache Controller, Address
Logic and Data Controller
Pico Power System Logic AT Base,
IDE Interface, Peripheral
Intel 256k x 8 Flash ROM
Chips & VGA Controller
Technologies
National Diskette Controller, IDE,
Semiconductor Parallel Interface
Mitsubishi Keyboard Controller
Cirrus Logic PCMCIA Controller
ESS Technology Sound Integrated Circuit
Technology
320-pin TCP
176-pin TQFP and
144-pin TQFP
176-pin TQFP
32-pin PLCC
208-pin QFP
100-pin FQFP
64-pin TQFP
208-pin TQFP
100-pin TQFP