NEC Versa 2500 Series Service Manual page 4

iv Contents
System BIOS Upgrade Procedure ................................................................................1-20
Section 2 General Specifications
Product Mix.................................................................................................................2-6
System Board Specifications ........................................................................................2-7
Transfer Board Specifications ......................................................................................2-8
Converter Board Specifications....................................................................................2-8
LED Indicator Board Specifications.............................................................................2-9
I/O Board Specifications ..............................................................................................2-10
LCD Inverter Board Specifications ..............................................................................2-12
LED Status Indicators Specifications ...........................................................................2-13
Diskette Drive Specifications .......................................................................................2-13
HDD Unit Specifications..............................................................................................2-14
CD-ROM Specifications ..............................................................................................2-14
NIMH Battery Pack Specifications...............................................................................2-14
DC/DC Converter & Battery Charger Specifications ....................................................2-15
Battery Charger Specifications .....................................................................................2-15
Keyboard Specifications...............................................................................................2-16
AC/DC Adapter Specifications.....................................................................................2-16
BIOS Specifications.....................................................................................................2-17
Micro-Controller Function Description ........................................................................2-18
Power Management Features (Mode Definition) ..........................................................2-19
Power Management Features (Mode Transition) ..........................................................2-20
Hot Key Definition.......................................................................................................2-21
Environmental Specifications .......................................................................................2-21
Power Source Specifications ........................................................................................2-22
Vibration Specifications ...............................................................................................2-22
Shock Specifications ....................................................................................................2-22
Electro-Static Discharge (ESD) Specifications .............................................................2-23
Section 3 Hardware Functional Overview
Functional Block Diagram............................................................................................3-2
System BIOS ...............................................................................................................3-2
System Processor..................................................................................................3-3
Major Functional Blocks .......................................................................................3-3
System Logic Controller ..............................................................................................3-4
Memory Subsystem......................................................................................................3-6