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