Serial Interface; Nec Versa Chip Set; Intel Pentium P55Clm Microprocessor; 256K X Flash Rom - NEC Versa 2600 Series Service Manual

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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 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 de-
fault serial port address is 3F8h and the interrupt level is IRQ04.

NEC VERSA CHIP SET

Refer to Table Section 1-3 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 acronyms.
Table Section 1-3 NEC Versa 2600 Series Chip Types and Technologies
Chip
Intel Pentium P54CSLM
Intel Pentium P55CL
N28F020-150
82C557M
82C556M
82C558E
PC87336VJG
H8/3434
C&T 65550B
OZ6730D
ESS1688

Intel Pentium P55CLM Microprocessor

The 133 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 power management
features. NEC adopted the chip specifically for its pipelined Floating Point Unit (FPU), and
local interrupt management.

256K X Flash ROM

The N28F020 flash ROM is a 40-pin, (TSOP). The chip allows easy updates to the system's
BIOS if needed. More specifically, the ROM is flashed electronically, installing the latest
BIOS revisions to the system. It is possible to reprogram the BIOS up to 100,000 times.
See Section 2, Setup and Operation, for BIOS update procedures.
Technical Information
Manufacturer
Intel
Intel
Intel
Opti Viper N+
Opti Viper N+
Opti Viper N+
National
Semiconductor
Hitachi
Chips &
Technologies
O2 Micro
ESS
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Description
133 MHz CPU
150MMX
256k x 8 Flash ROM
System Controller
Data Path Controller
PCI IDE ISA Xcelerator
Diskette Controller, IDE,
Parallel Interface
Keyboard Controller
VGA Controller
PC Card Controller
Sound Controller
Technology
320-pin TCP
320-pin TCP
32-pin TSOP
208-pin TQFP
176-pin TQFP
208-pin TQFP
100-pin QFP
100-pin TQFP
208-pin FQFP
208-pin PQFP
100-pin PQFP