NEC PowerMate VP75 Reference Manual
PROPRIETARY NOTICE A ND LIABILITY DISCLAIMER
The information disclosed in this document, including all designs and related materials, is the valuable property of NEC Corporation (NEC) and/or its licensors. NEC and/or its li censors, as appropriate, reserve all patent, copyright and other proprietary rights to this document, including all
design, manufacturing, reproduction, use, and sales rights thereto, except to the extent said rights
are expressly granted to others.
The NEC product(s) discussed in this document are warranted in accordance with the terms of
the Warranty Statement accompanying each product. However, actual performance of each such
product is dependent upon factors such as system configuration, customer data, and operator
control. Since implementation by customers of each product may vary, the suitability of specific
product configurations and applications must be determined by the customer and is not warranted
by NEC.
To allow for design and specification improvements, the information in this document is subject to
change at any time, without notice. Reproduction of this document or portions thereof without
prior written approval of NEC is prohibited.
FastFacts, NEC SVGA, and PowerMate are U.S. trademarks of NEC Technologies, Inc.
All other product, brand, or trade names used in this publication are the trademarks or registered
trademarks of their respective trademark owners.
First Printing — February 1995
Copyright 1995 Copyright 1995
NEC Technologies, Inc. NEC Corporation
1414 Massachusetts Avenue 7-1 Shiba 5-Chome, Minato-Ku
Boxborough, MA 01719 Tokyo 108-01, Japan
All Rights Reserved All Rights Reserved
iii
Contents
Page
Preface ..................................................................................................................................xi
Abbreviations....................................................................................................................... xiii
Section 1 Technical Information
Desktop System Unit......................................................................................................... 1-2
Minitower System Unit ...................................................................................................... 1-3
System Board............................................................................................................ 1-4
Processor........................................................................................................... 1-6
Secondary Cache ............................................................................................... 1-6
Flash ROM........................................................................................................ 1-6
Power Management............................................................................................ 1-7
I/O Addressing................................................................................................... 1-8
System Memory................................................................................................. 1-9
Interrupt Controller............................................................................................. 1-10
Video Controller................................................................................................. 1-11
Video Memory................................................................................................... 1-12
IDE/PCI -Bus Backboard........................................................................................... 1-13
ISA Bus ............................................................................................................. 1-13
PCI Local Bus.................................................................................................... 1-14
PCI Auto Configuration...................................................................................... 1-14
Parallel Interface ........................................................................................................ 1-14
Serial Interface........................................................................................................... 1-15
Indicator Panel........................................................................................................... 1-16
Power Supply ................................................................................................................... 1-16
Diskette Drive ................................................................................................................... 1-16
Hard Disk Drive................................................................................................................ 1-16
Network Board................................................................................................................. 1-17
Multimedia Components.................................................................................................... 1-17
Quad-Speed CD-ROM............................................................................................. 1-17
Sound Board ............................................................................................................. 1-17
Speakers ................................................................................................................... 1-18
iv Contents
Microphone ............................................................................................................... 1-19
Keyboard ......................................................................................................................... 1-19
Mouse .............................................................................................................................. 1-19
Power Management .......................................................................................................... 1-19
Plug and Play.................................................................................................................... 1-19
Desktop Management Interface......................................................................................... 1-20
DMI Components...................................................................................................... 1-21
Manageable Products................................................................................................. 1-21
CI Module................................................................................................................. 1-21
MIF Browser............................................................................................................. 1-21
Usage ........................................................................................................................ 1-22
Troubleshooting ......................................................................................................... 1-22
Section 2 Setup and Operation
Unpacking and Repacking................................................................................................. 2-1
Setup ................................................................................................................................ 2-1
Minitower Setup ........................................................................................................ 2-7
CD-ROM Reader............................................................................................................. 2-12
External Multimedia Connections ....................................................................................... 2-13
Connecting the Speakers............................................................................................ 2-13
System Configuration......................................................................................................... 2-15
How to Start Setup .................................................................................................... 2-16
How to Use Setup ..................................................................................................... 2-16
Menu Bar........................................................................................................... 2-17
Legend Bar......................................................................................................... 2-18
Field Help Window............................................................................................. 2-18
General Help Window........................................................................................ 2-19
Main Menu Options............................................................................................ 2-19
IDE Adapters..................................................................................................... 2-20
Memory Shadow................................................................................................ 2-21
Boot Sequence................................................................................................... 2-22
Numlock ............................................................................................................ 2-23
Advanced Menu ........................................................................................................ 2-24
Integrated Peripherals Menu................................................................................ 2-24
Parity .................................................................................................................. 2-25
Contents v
Large Disk Access Mode ................................................................................... 2-25
Security Menu............................................................................................................ 2-26
Power Menu.............................................................................................................. 2-27
Exit Menu.................................................................................................................. 2-28
Save Changes & Exit .......................................................................................... 2-29
Discard Changes & Exit...................................................................................... 2-29
Get Default Values.............................................................................................. 2-29
Load Previous Values......................................................................................... 2-30
Save Changes..................................................................................................... 2-30
Bios Update Utility............................................................................................................ 2-30
System Board Jumpers...................................................................................................... 2-31
Jumper Locations....................................................................................................... 2-32
Jumper Settings.......................................................................................................... 2-32
Changing Jumper Settings.................................................................................... 2-35
CMOS Jumper................................................................................................... 2-35
Section 3 Options
Internal Options................................................................................................................. 3-1
Desktop Cover Removal............................................................................................ 3-2
Minitower Top Cover Removal.................................................................................. 3-3
Expansion Board(s).................................................................................................... 3-4
Desktop Expansion Board Installation................................................................. 3-5
Minitower Expansion Board Installation............................................................... 3-7
Expansion Board Troubleshooting....................................................................... 3-8
System Board Options ............................................................................................... 3-10
OverDrive Processor Installation......................................................................... 3-10
OverDrive Processor Troubleshooting................................................................. 3-13
SIMM Memory Installation................................................................................. 3-14
SIMM Upgrade Path.......................................................................................... 3-14
SIMM Installation............................................................................................... 3-16
SIMM Upgrade Kit Troubleshooting................................................................... 3-17
Video DRAM Module Installation....................................................................... 3-18
Video DRAM Module Troubleshooting............................................................... 3-20
Optional Storage Devices.................................................................................................. 3-21
5 1/4-Inch Diskette Drive........................................................................................... 3-21
vi Contents
5 1/4-Inch Diskette Drive Settings....................................................................... 3-21
Hard Disk Drives....................................................................................................... 3-22
Hard Disk Drive Settings..................................................................................... 3-22
Desktop Optional Storage Device Installation..................................................................... 3-24
Desktop 3 1/2-inch Drive Bracket Removal................................................................ 3-24
Desktop Blank Panel Removal................................................................................... 3-25
Desktop Device Installation........................................................................................ 3-26
Desktop 5 1/4-Inch Diskette Drive Cabling......................................................... 3-27
Desktop 5 1/4-Inch Hard Disk Drive Cabling...................................................... 3-28
Completing Desktop Device Installation...................................................................... 3-29
Minitower 5 1/4-Inch Optional Device Installation.............................................................. 3-30
Minitower Front Panel, Blank Panel, and Device Cage Removal................................. 3-30
Minitower 5 1/4-Inch Optional Device Installation....................................................... 3-33
Minitower 5 1/4-Inch Diskette Drive Cabling....................................................... 3-34
Minitower 5 1/4-Inch Hard Disk Drive Cabling ................................................... 3-35
Completing Minitower 5 1/4-Inch Device Installation........................................... 3-36
Minitower Optional 3 1/2-Inch Hard Drive Installation....................................................... 3-36
Hard Disk Drive Troubleshooting....................................................................................... 3-38
Section 4 Maintenance and Troubleshooting
Maintenance...................................................................................................................... 4-2
System Unit ............................................................................................................... 4-2
Keyboard.................................................................................................................. 4-3
Mouse....................................................................................................................... 4-4
Troubleshooting................................................................................................................. 4-5
Error Messages.......................................................................................................... 4-5
Diagnosing and Solving Problems ............................................................................... 4-7
Beep Codes............................................................................................................... 4-11
Bios Update Utility............................................................................................................ 4-11
NEC Bulletin Board Service....................................................................................... 4-12
Using the BIOS Update Utility.................................................................................... 4-13
Section 5 Desktop Repair
Disassembly and Reassembly............................................................................................. 5-1
Top Cover Removal................................................................................................... 5-3
Contents vii
Expansion Board Removal......................................................................................... 5-4
ISA/PCI-BUS Backboard Removal........................................................................... 5-7
3 1/2-inch Diskette and Hard Disk Drive Removal...................................................... 5-8
Front Panel Assembly Removal.................................................................................. 5-10
Power Button Cover Removal.................................................................................... 5-11
Speaker Assembly Removal....................................................................................... 5-12
SIMM Removal......................................................................................................... 5-13
Optional 5 1/4-Inch Device Removal.......................................................................... 5-14
5 1/4-Inch Device Cage Removal............................................................................... 5-15
Power Supply Removal.............................................................................................. 5-16
System Board Removal.............................................................................................. 5-18
Illustrated Parts Breakdown ....................................................................................... 5-19
Section 6 Minitower Repair
Disassembly and Reassembly............................................................................................. 6-1
Top Cover Removal................................................................................................... 6-3
Bottom Access Cover Removal.................................................................................. 6-5
Expansion Board Removal......................................................................................... 6-6
Front Panel Assembly Removal.................................................................................. 6-7
Power Button Cover Removal.................................................................................... 6-8
Blank Panel and Metal Cover Plate Removal.............................................................. 6-9
Speaker Assembly Removal....................................................................................... 6-10
SIMM Removal......................................................................................................... 6-11
5 1/4-Inch Device Cage Removal............................................................................... 6-12
5 1/4-Inch Device Removal........................................................................................ 6-13
3 1/2-inch Hard Disk Drive Removal.......................................................................... 6-14
3 1/2-inch Diskette Drive Removal............................................................................. 6-16
Power Supply Removal.............................................................................................. 6-19
PCI/ISA Backboard Removal.................................................................................... 6-21
System Board Removal.............................................................................................. 6-22
Illustrated Parts Breakdown ....................................................................................... 6-23
Appendix A Connector Pin Assignments
Serial Interface Connectors................................................................................................ A-3
Parallel Interface Connector............................................................................................... A-4
viii Contents
VGA Interface Connector Pin Assignments........................................................................ A-5
Speaker Connector Pin Assignments.................................................................................. A-5
Power Supply Connector .................................................................................................. A-6
Keyboard and Mouse Connectors..................................................................................... A-6
Power Lamp Connector.................................................................................................... A-7
Hard Disk Drive Busy Lamp Connector............................................................................. A-7
Fan Connector.................................................................................................................. A-7
Suspend Button Connector................................................................................................ A-8
Diskette Drive Interface Pin Assignments ........................................................................... A-8
IDE Interface Connectors.................................................................................................. A-9
SIMM Sockets................................................................................................................. A-10
ISA/PCI-Bus Backboard Connector Pin Assignments........................................................ A-11
ISA Expansion Bus Connector Pin Assignments................................................................. A-13
Sound Board Pin Assignments........................................................................................... A-15
Appendix B Specifications
System Unit Specifications................................................................................................ B-1
Power Supply Specifications............................................................................................. B-3
Diskette Drive Specifications ............................................................................................ B-4
Hard Disk Specifications .................................................................................................. B-6
Appendix C CD-ROM Reader Configuration
Appendix D Sound Board Configuration
Changing Hardware Settings.............................................................................................. D-1
MIDI Base I/O Address ............................................................................................ D-3
Joystick Connector .................................................................................................... D-3
Audio Interface DMA Channel................................................................................... D-4
Audio Interface Base I/O Address.............................................................................. D-6
Audio Interface IRQ Line........................................................................................... D-7
MIDI Interface........................................................................................................... D-8
List of Figures
1-1 Desktop System Controls and Storage Slots........................................................ 1-2
1-2 Minitower System Controls and Storage Slots..................................................... 1-3
Contents ix
2-1 Desktop Voltage Selector Switch........................................................................ 2-2
2-2 Desktop Peripherals Connections........................................................................ 2-3
2-3 Desktop Network Board Connections ................................................................ 2-4
2-4 Desktop Multimedia Connections........................................................................ 2-5
2-5 Desktop Power Button, Lamps, and Suspend Button........................................... 2-6
2-6 Minitower Voltage Selector Switch..................................................................... 2-7
2-7 Minitower Peripherals Connections ..................................................................... 2-8
2-8 Minitower Network Board Connections.............................................................. 2-9
2-9 Minitower Sound/Fax/Modem Board Connectors ............................................... 2-10
2-10 Minitower Power Button, Indicators, and Suspend Button................................... 2-11
2-11 CD-ROM Reader Controls and Indicators.......................................................... 2-12
2-12 Ready 9520 Speaker Connections ...................................................................... 2-14
2-13 Locating system configuration jumpers................................................................. 2-32
2-14 SIMM Type Jumper JP1 .................................................................................... 2-33
2-15 Processor Speed Jumpers JP5, JP6, and JP7...................................................... 2-33
2-16 Bus speed jumper JP10 ...................................................................................... 2-34
2-17 Processor voltage jumper JP12........................................................................... 2-34
3-1 Desktop Cover Screws....................................................................................... 3-2
3-2 Removing the Desktop Cover ............................................................................. 3-2
3-3 Minitower Cover Screws.................................................................................... 3-3
3-4 Removing the Minitower Cover........................................................................... 3-4
3-5 Desktop Expansion Slots .................................................................................... 3-5
3-6 Inside Expansion Slot Screw............................................................................... 3-6
3-7 Removing the Inside Expansion Slot Bracket ....................................................... 3-6
3-8 Minitower Expansion Slots.................................................................................. 3-7
3-9 Locating the Processor Socket............................................................................ 3-11
3-10 Removing the Heat Sink and Processor............................................................... 3-11
3-11 Processor Alignment ........................................................................................... 3-12
3-12 SIMM Socket Location...................................................................................... 3-16
3-13 SIMM Installation............................................................................................... 3-16
3-14 Video DRAM Socket Location........................................................................... 3-18
3-15 Video DRAM Module Installation....................................................................... 3-19
3-16 OSDA-90C, 1.44-MB Diskette Drive ................................................................ 3-21
3-17 FD-55GFR, 1.2-MB Diskette Drive ................................................................... 3-22
3-18 WDAC2540 540-MB Hard Disk Drive.............................................................. 3-23
3-19 CFA1275 1.275-GB Hard Disk Drive................................................................ 3-23
x Contents
3-20 3 1/2-Inch Drive Bracket Screws........................................................................ 3-24
3-21 Desktop Front Panel Removal............................................................................. 3-25
3-22 Blank Panel Removal.......................................................................................... 3-26
3-23 Desktop 5 1/4-Inch Device Screws..................................................................... 3-27
3-24 Desktop 5 1/4-Inch Diskette Drive Cables.......................................................... 3-28
3-25 Desktop 5 1/4-Inch Hard Disk Drive Cables....................................................... 3-29
3-26 Front Panel Removal........................................................................................... 3-30
3-27 Minitower Blank Panel Removal.......................................................................... 3-31
3-28 Device Cage Removal......................................................................................... 3-32
3-29 Minitower 5 1/4-Inch Device Screws.................................................................. 3-33
3-30 Minitower 5 1/4-Inch Diskette Drive Cables........................................................ 3-34
3-31 Minitower 5 1/4-Inch Hard Disk Drive Cables .................................................... 3-35
3-32 Installing Optional 3 1/2-Inch Hard Disk Drive .................................................... 3-37
4-1 Removing the Keyboard Enclosure...................................................................... 4-3
4-2 Removing the Mouse Ball Cover......................................................................... 4-4
5-1 Top Cover Screws ............................................................................................. 5-3
5-2 Removing the Top Cover.................................................................................... 5-4
5-3 Expansion Slot Screw......................................................................................... 5-5
5-4 Inside Expansion Slot Screw............................................................................... 5-5
5-5 Removing the Expansion Slot L-Bracket.............................................................. 5-6
5-6 ISA/PCI-Bus Backboard Screws ....................................................................... 5-7
5-7 1/2-Inch Drive Bracket Screws........................................................................... 5-8
5-8 1/2-Inch Diskette and Hard Disk Drive Screws................................................... 5-9
5-9 Indicator Panel Connectors................................................................................. 5-10
5-10 Power Button Tabs............................................................................................. 5-11
5-11 Speaker Screw................................................................................................... 5-12
5-12 SIMM Socket.................................................................................................... 5-13
5-13 5 1/4-Inch Device Screws................................................................................... 5-14
5-14 5 1/4-Inch Device Cage Screws.......................................................................... 5-15
5-15 Power Button Screws......................................................................................... 5-16
5-16 Power Supply Screws......................................................................................... 5-17
5-17 PowerMate VP Series Desktop Illustrated Parts Breakdown*............................. 5-21
6-1 Removing the Top Cover Screws........................................................................ 6-3
6-2 Removing the Top Cover.................................................................................... 6-4
6-3 Minitower Bottom Access Cover........................................................................ 6-5
6-4 Expansion Slot Screw......................................................................................... 6-6
Contents xi
6-5 Front Panel Screws............................................................................................. 6-7
6-6 Power Button Tabs............................................................................................. 6-8
6-7 Blank Panel Removal.......................................................................................... 6-9
6-8 Speaker Tabs..................................................................................................... 6-10
6-9 SIMM Socket.................................................................................................... 6-11
6-10 Removing the Device Cage Screws..................................................................... 6-12
6-11 5 1/4-Inch Device Screws................................................................................... 6-13
6-12 3 1/2-Inch Hard Disk Drive Cables..................................................................... 6-14
6-13 Removing the 3 1/2-Inch Hard Disk Drive........................................................... 6-15
6-14 3 1/2-In ch Diskette Drive Cables........................................................................ 6-16
6-15 Diskette Drive Bracket Screws ........................................................................... 6-17
6-16 Diskette Drive Screws ........................................................................................ 6-18
6-17 Power Button Screws......................................................................................... 6-19
6-18 Power Supply Screws......................................................................................... 6-20
6-19 Chassis Support Bracket Screws ........................................................................ 6-21
6-20 PowerMate VP75 Series Minitower Illustrated Parts Breakdown* ...................... 6-25
A-1 System Board Layout ......................................................................................... A-1
A-2 Serial Interface (J3/J10)...................................................................................... A-3
A-3 Parallel Interface (J15)........................................................................................ A-4
A-4 Power Supply Connector (J8) Pin Assignments ................................................... A-6
C-1 Rear View of the Quadruple Speed Reader......................................................... C-1
C-2 Quadruple Speed Reader Jumper Settings........................................................... C-2
D-1 Jumpers on the Sound Board .............................................................................. D-2
D-2 Base I/O Address Settings of MPU-401 UART MIDI........................................ D-3
D-3 Joystick Connector Settings ................................................................................ D-3
D-4 Low DMA Channel Settings ............................................................................... D-4
D-5 High DMA Channel Settings ............................................................................... D-5
D-6 Base I/O Address Settings for the Audio Interface............................................... D-6
D-7 IRQ Line Settings for the Audio Interface............................................................ D-7
D-8 MPU-401 UART MIDI Settings......................................................................... D-8
List of Tables
1-1 System Board Chips........................................................................................... 1-5
1-2 System Memory Map......................................................................................... 1-7
1-3 I/O Address Map............................................................................................... 1-8
xii Contents
1-4 Interrupt Level Assignments ................................................................................ 1-10
1-5 Video Resolutions and Frequencies..................................................................... 1-12
1-6 Parallel Port Addressing and Interrupts................................................................ 1-15
1-7 Serial Port Addressing and Interrupts .................................................................. 1-15
2-1 Setup Key Functions........................................................................................... 2-18
2-2 Legend Bar Main Menu Parameters.................................................................... 2-19
2-3 IDE Hard Disk Parameters ................................................................................. 2-21
2-4 Memory Shadow Parameters.............................................................................. 2-22
2-5 Boot Parameters................................................................................................. 2-22
2-6 Numlock Parameters .......................................................................................... 2-23
2-7 Integrated Peripherals Parameters ....................................................................... 2-25
2-8 Large Disk Parameters........................................................................................ 2-25
2-9 System Security Options ..................................................................................... 2-26
2-10 Power Management Parameters.......................................................................... 2-28
3-1 Expansion Board Problems and Solutions............................................................ 3-9
3-2 OverDrive Problems and Solutions...................................................................... 3-13
3-3 Single-Sided SIMM Upgrade Path...................................................................... 3-15
3-4 Double-Sided SIMM Upgrade Path.................................................................... 3-15
3-5 SIMM Upgrade Problems and Solutions ............................................................. 3-17
3-6 Video DRAM Module Problems and Solutions ................................................... 3-20
3-7 Optional 5 1/4-Inch Device Problems and Solutions ............................................ 3-38
4-1 NEC Service and Information Telephone Numbers.............................................. 4-1
4-2 System Error Messages ...................................................................................... 4-5
4-3 ISA NMI Error Messages .................................................................................. 4-7
4-4 Problems and Solutions....................................................................................... 4-7
4-5 Diagnostic Beep Codes....................................................................................... 4-11
5-1 PowerMate VP Series Desktop Disassembly Sequence...................................... 5-1
5-2 PowerMate VP Series Desktop Field-Replaceable Parts List* ............................ 5-19
5-3 PowerMate VP Series Desktop Options*........................................................... 5-22
5-4 PowerMate VP Series Desktop Documentation and Packaging ........................... 5-22
6-1 PowerMate VP Series Minitower Disassembly Sequence.................................... 6-1
6-2 PowerMate VP Minitower Field-Replaceable Parts List...................................... 6-23
6-3 PowerMate VP Series Minitower Options........................................................... 6-26
6-4 PowerMate VP Minitower Documentation and Packaging* ................................. 6-26
A-1 System Board Connector Descriptions ................................................................ A-2
A-2 Video Connector (J20) Pin Assignments.............................................................. A-5
Contents xiii
A-3 Speaker Connector (J18) Pin Assignments.......................................................... A-5
A-4 Keyboard (J1) and Mouse (J2) Connector Pin Assignments ................................ A-6
A-5 Power Lamp Connector (J16) Pin Assignments................................................... A-7
A-6 Hard Disk Drive Lamp Connector (J14) Pin Assignments.................................... A-7
A-7 Fan Connector Pin Assignments.......................................................................... A-7
A-8 Suspend Button Connector (J11) Pin Assignments............................................... A-8
A-9 Diskette Drive Connector (J5) Pin Assignments................................................... A-8
A-10 IDE/PCI Connector Pin Assignments (J4,J7)....................................................... A-9
A-11 SIMM Socket Pin Assignments........................................................................... A-10
A-12 ISA/PCI-Bus Backboard Connector Pin Assignments......................................... A-11
A-13 ISA Expansion Slot Pin Assignments................................................................... A-13
A-14 Sound Board Signal Connector........................................................................... A-15
A-15 Audio Connector................................................................................................ A-16
A-16 MIDI/Joystick Connector ................................................................................... A-16
B-1 System Unit Specifications .................................................................................. B-1
B-2 Power Supply Input Requirements....................................................................... B-3
B-3 Power Supply Output Specifications.................................................................... B-4
B-4 Specifications for Diskette Drives........................................................................ B-4
B-5 Specifications for 540-MB and 1.275-GB Hard Disk Drives............................... B-6
xv
Preface
This service and reference manual contains the technical information necessary to set up, maintain,
troubleshoot, and repair the NEC PowerMate VP75 series of computer systems. The manual
also provides hardware and interface information for users who need an overview of the computer system design. The manual is written for NEC-trained customer
engi neers, system analysts, service center personnel, and dealers.
The manual is organized as follows:
Section 1, Technical Information, provides an overview of the computer features, hardware
design, interface ports, and internal devices.
Section 2, Setup and Operation, takes the user from unpacking to setup and operation. In-
cluded is a description of the system configuration, system password, and the computer’s jumper
settings, including the factory default settings.
Section 3, Options, provides the user with installation and troubleshooting information for each
specific option.
Section 4, Maintenance and Troubleshooting, includes recommended maintenance
i nformation and lists possible problem and solutions for the computer.
Section 5, Desktop Repair, includes a list of NEC service information and telephone num bers
that provide access to the NEC Bul letin Board System (BBS), FastFacts™, and Technical Information Bulletins. Included are desktop disassembly and reassembly procedures along with an
illustrated parts breakdown. NEC service and spare parts ordering inform ation is also provided.
Section 6, Minitower Repair, includes a list of NEC service inform ation and telephone numbers that provide access to the NEC Bulletin Board System (BBS), FastFacts, and Techni cal Inform ation Bulletins. Included are minitower disassembly and reassembly procedures along with an
illustrated parts breakdown. NEC service and spare parts ordering information is also provided.
Appendix A, Connector Pin Assignments, provides a list of the system boards' internal connector pin assignments and a list of external pin assignments for the keyboard/mouse, serial port,
parallel port, and video port.
Appendix B, Specifications, provides specifications for the system unit, power supply, diskette
drives, hard disk drives, CD-ROM reader, sound board, and network board.
Appendix C, CD-ROM Reader Configuration, provides connector and jumper setting information for the quad-speed reader.
Appendix D, Sound Board Configuration, provides connector and jumper setting inform ation
for the Creative Technology Ltd® 2261 sound board.
Abbreviations
xvii
A ampere
AC alternating current
AT advanced technology
(IBM PC)
BBS Bulletin Board System
BCD binary-coded decimal
BCU BIOS Customized Utility
BIOS basic input/output system
bit binary digit
BUU BIOS Upgrade Utility
bpi bits per inch
bps bits per second
C capacitance
C centigrade
Cache high-speed buffer storage
CAM constantly addressable memory
CAS column address strobe
CD-ROM compact disk-ROM
CG character generator
CGA Color Graphics Adapter
CGB Color Graphics Board
CH channel
clk clock
cm centimeter
CMOS complementary metal oxide
semiconductor
COM communication
CONT contrast
CPGA ceramic pin grid array
CPU central processing unit
DAC digital-to-analog converter
DACK DMA acknowledge
DC direct current
DIP dual in-line package
DLAB Divisor Latch Address bit
DMA direct memory access
DMAC DMA controller
DOS disk operating system
DRAM dynamic RAM
ECC error checking and correction
EGA Enhanced Graphics Adapter
EPROM erasable and programmable
ROM
EVGA Enhanced Video Graphics
Array
F Fahrenheit
FAX facsimile transmission
FCC Federal Communications
Commission
FG frame ground
FM frequency modulation
FRU field-replaceable unit
GB gigabyte
GND ground
HEX hexadecimal
HGA Hercules Graphics Adapter
Hz hertz
IC integrated circuit
ID identification
IDE intelligent device electronics
IDTR interrupt descriptor table
register
in. inch
INTA interrupt acknowledge
IPB illustrated parts breakdown
IRR Interrupt Request register
ISA Industry Standard Architecture
ISR In Service register
I/O input/output
IPC integrated peripheral controller
ips inches per second
IRQ interrupt request
xviii Abbreviations
K kilo (1024)
k kilo (1000)
KB kilobyte
kg kilogram
kHz kilohertz
lb pound
LED light-emitting diode
LSB least-significant bit
LSI large-scale integration
M mega
mA milliamps
max maximum
MB megabyte
MDA Monochrome Display Adapter
MFM modified frequency modulation
MHz megahertz
mm millimeter
ms millisecond
MSB most-significant bit
NASC National Authorized Service
Center
QFP quad flat pack
RAM random-access memory
RAMDAC RAM digital-to-analog
RAS row address strobe
RGB red green blue
RGBI red green blue intensity
ROM read-only memory
rpm revolutions per minute
R read
RTC real-time clock
R/W read/write
S slave
SCSI Small Computer System
Interface
SG signal ground
SIMM single inline memory module
SVGA Super Video Graphics Array
SW switch
TAC Technical Assistance Center
TSC Technical Support Center
TTL transistor/transistor logic
NC not connected
NMI Non-maskable Interrupt
ns nanosecond
NSRC National Service Response
Center
PAL programmable array logic
PC personal computer
PCB printed circuit board
PFP plastic flat package
PIO parallel input/output
pixel picture element
PLCC plastic lead chip carrier
PLL phase lock loop
p-p peak-to-peak
PPI programmable peripheral
interface
PROM programmable ROM
tpi tracks per inch
V volt
Vdc volts, direct current
VESA video electronics standards
association
VGA Video Graphics Array
VRAM virtual RAM
W watt
W write
Section 1
Technical Information
The PowerMate VP75 Series includes the PowerMate VP75D (desktop) and PowerMate
VP75MT (minitower) systems in several configurations. The configurations include:
n desktop and minitower diskless systems (diskette drive, no hard disk)
n desktop and minitower hard disk systems (diskette drive, hard disk)
n desktop and minitower hard disk network systems (diskette drive, hard disk, network
board)
n desktop and minitower multimedia systems (diskette drive, hard disk, CD-ROM
reader, multimedia components).
All configurations use the Intel 75 MHz Pentium™ processor and are Energy Star
compliant.
The information in this manual applies to all configurations, except where indicated. This section
provides an overview of the PowerMate VP75 Series system hardware.
Overviews of the desktop and minitower system unit styles are described in the following
subsections.
1-2 Technical Information
DESKTOP SYSTEM UNIT
The desktop chassis provides an enclosure for the system board, power supply, four storage device slots, a five-connector PCI/ISA backboard, and four expansion slots. The expansion slots
include three ISA slots and one shared PCI/ISA slot. For network configurations, one slot has a
network board installed and the three remaining slots are empty. For multimedia configurations,
one slot has a sound board installed and the three remaining slots are empty. All other configurations ship with the slots empty.
The storage device slots can accommodate a 3 1/2-inch diskette drive, a 3 1/2-inch hard disk (1inch height), and two accessible 5 1/4-inch storage devices (1.6-inch height). The non-multimedia
hard disk systems ship with a 3 1/2-inch diskette drive and 3 1/2-inch hard disk drive, leaving
two accessible 5 1/4-inch storage device slots available for optional devices. The multimedia systems ship with a 3 1/2-inch diskette drive, 3 1/2-inch hard disk drive, and a 5 1/4-inch CD-ROM
reader, leaving one accessible 5 1/4-inch storage device slot available for an optional device.
Figure Section 1-1 shows front panel features of a typical desktop system. Multimedia systems
come with a quad-speed CD-ROM reader installed in the upper accessible device slot.
Figure Section 1-1 Desktop System Controls and Storage Slots
Technical Information 1-3
MINITOWER SYSTEM UNIT
The minitower chassis provides an enclosure for the system board, power supply, five
storage device slots, a six-connector PCI/ISA backboard, and five expansion slots. The
expansion slots include three ISA slots, one dedicated PCI slot, and one shared PCI/ISA slot.
For network configurations, one slot has a network board installed and the four remaining slots
are empty. For multimedia configurations, one slot has a sound board installed and the four remaining slots are empty. All other configurations ship with the slots empty.
The storage device slots can accommodate a 3 1/2-inch diskette drive, two 3 1/2-inch hard
disks, and three accessible 5 1/4-inch storage devices (1.6-inch height). The non-multimedia hard
disk systems ship with a 3 1/2-inch diskette and a 3 1/2-inch hard disk drive, leaving three accessible 5 1/4-inch storage device slots available for optional devices. The multimedia systems ship
with a 3 1/2-inch diskette, a 3 1/2-inch hard disk drive, and a
5 1/4-inch CD-ROM reader, leaving two 5 1/4-inch storage device slots available for
optional devices.
Figure Section 1-2 shows front panel features of a typical minitower system. Multimedia systems
come with a quad-speed CD-ROM reader installed in the lower accessible device slot.
Figure Section 1-2 Minitower System Controls and Storage Slots
1-4 Technical Information
System Board
The system board is identical for all configurations. The system board contains a Flash ROM
which is upgradeable through the BIOS Update utility (see Section 2).
Key features of the system board are as follows:
n Intel Pentium 75 MHz Pentium processor
n 16 kilobyte (KB) internal dual write-back cache integrated on the processor
n 256-KB write-back secondary cache memory
n PCI local bus for fast data transfer
n support for Intel processor upgrades
n 8 megabytes (MB) of random access memory (RAM) (16 MB in the multimedia con-
figurations)
accepts 32-bit or 36-bit, 70-nano second (ns) single-inline memory modules
(SIMMs)
expandable to 128 MB
n Peripheral Component Interconnect (PCI) graphics controller and 32-bit PCI bus
supports 640 x 480 resolution with up to 16.8 million colors, 800 x 600 with up to
16.8 million colors, 1024 x 768 with up to 64 K colors, and 1280 x 1024 with up
to 256 colors
1-MB (two 256K x 16) video dynamic RAM (DRAM), expandable to 2 MB
supports Display Data Channel (DDC) monitors.
n two intelligent drive electronics (IDE) interface connectors
one fast IDE/PCI connector (primary interface) used by the hard disk drive to
transfer data at the hard disk's opti mum rate
one standard IDE connector (secondary interface) used for the CD-ROM reader
n energy saving features: system switches to power save mode when idle for an
established amount of time
n 3 1/2-inch, 1.44-MB diskette drive
Technical Information 1-5
n PCI/ISA backboard configurations
desktop: three ISA expansion slots and one shared PCI/ISA slot
minitower: three ISA expansion slots, one dedicated PCI slot, and one shared
PCI/ISA slot
n external connectors providing an interface for the following external devices:
VGA-compatible monitor
personal system/2 (PS/2®)-style mouse
PS/2-style keyboard
Enhanced Parallel Port (ECP) and enhanced capabilities port (ECO) are supported
for a parallel printer
two buffered serial ports
multimedia MIDI/joystick, speakers, microphone, and headphone connectors on
the sound board (multimedia configurations only).
Table Section 1-1 lists the major chips on the system board. See Section 2, Setup and Operation, for a description of the system board's jumpers. See Appendix A, Connector Pin Assignments, for a list of the system board connectors.
Table Section 1-1 System Board Chips
Chip Description
P54C (CPGA) 75-MHz Intel Pentium processor
28F001 128k x 8 Flash ROM
Intel Mercury PCI/ISA Chip Set
8243LX
82433LX
82378ZB
Intel 82091AA Super I/O controller
Dallas DS12887 Real-time clock
Cirrus Logic CL-GD5430/34 PCI graphics controller
PCI cache and memory controller
Local bus extension
System I/O bridge
1-6 Technical Information
Processor
The PowerMate VP series of computers use the 75 MHz Pentium processor with an
internal speed of 75 MHz and an external speed of 50 MHz. The processor has 16 KB of writeback internal cache, 8 KB for instructions and 8 KB for data. A math coprocessor is integrated in
the processor.
The processor is an advanced 64-bit processor designed to optimize multitasking operating systems. The 64-bit registers and data paths support 64-bit addresses and data types.
To use the Pentium processor’s power, the system features an optimized 64-bit memory interface
and complementary 256-KB burst-mode secondary cache.
The processor cache design uses 15-ns static random access memory (SRAM) that allows data
to be sent or received from cache with one wait burst.
The processor is compatible with 8-, 16-, and 32-bit software written for the Intel386™, Intel486™, and Pentium processors.
To accommodate future technologies and work requirements, the Pentium processor comes in a
320-pin ZIF socket. The socket provides an upgrade path to the next generation processor.
Secondary Cache
The 16-KB primary cache is integrated in the processor. The system board contains 256 KB of
secondary cache, external to the processor. Cache memory improves read perform ance by holding copies of code and data that are frequently requested from the system memory by the processor. Cache memory is not considered part of the expansion memory.
The cache is connected directly to the processor address bus and uses physical addresses. A bus
feature known as burst enables fast cache fills. Memory areas (pages) can be designated as
cacheable or non-cacheable by software. The cache can also be enabled and disabled by software.
The write strategy of the cache (primary and secondary) is write-through. If the write is a cache
hit, an external bus cycle is generated and information is written to the cache. Any area of memory can be cached in the system. Non-cacheable portions of memory are defined by software.
The cache can be cleared by software instructions.
Flash ROM
Machine language programs are stored in a 28F010 Flash ROM known as the system's ROM
BIOS. The system BIOS and video BIOS are contained in the ROM. The Flash ROM is 128
KB. It consists of 64 KB of system BIOS and 32 KB of video BIOS.
Technical Information 1-7
The Flash ROM allows the BIOS to be upgraded with the BIOS Update utility without
removing the ROM (see Section 2, Setup and Configuration). The BIOS can only be reprogrammed by powering on the system with the BIOS Update utility diskette in Drive A.
The BIOS programs execute the Power-On Self-Test, initialize processor controllers, and interact with the display, diskette drives, hard disks, communication devices, and peripherals. The
sy stem BIOS also contains the Setup program and provides VGA controller support. The hardware setup default copies the ROM BIOS into RAM (shadowing) for maximum performance.
System BIOS is located in the upper portion of the Flash ROM and video BIOS in the lower
portion. System BIOS is located between F0000h-FFFFFh and supports shadowing and shadowed memory. System BIOS is write protected and automatically enabled.
Video BIOS is located between C0000h and C7FFFh. If the internal video is disabled, this range
is mapped to ISA. The system memory map in shown in Table Section 1-2.
Table Section 1-2 System Memory Map
Memory Space Size Function
000000-07FFFF 512 KB Conventional base memory
080000-09FBFF 128 KB Extended conventional base memory
09FC00-09FFFF 1 KB Extended BIOS Data
0A0000-0BFFFF 128 KB On-board video memory
0C0000-0C7FFF 32 KB On-board BIOS
0C8000-0E7FFF 128 KB Available high DOS memory (open to ISA and PCI bus)
0E8000-0ECFFF 20 KB Plug-n-Play ESCD data
0ED000-OEDFFF 4 KB Reserved for logo
0EE000-0EFFFF 8 MB Flash boot block (available for HIMEM)
0F0000-0FFFFF 64 KB System BIOS
1000000- On-Board 130 MB Extended and/or Expanded system memory
Flash ROM supports the reprogramming of the system and built-in video BIOS. A jumper on the
system board enables or disables the BIOS flashing feature. The factory default for the jumper is
enabled, allowing the BIOS to be flashed. See Section 2, Setup and Operation, for jumper information. If the BIOS upgrade is interrupted, see Section 4, Maintenance and Troubleshooting, for
information on recovering the BIOS if there is a catastrophic failure.
1-8 Technical Information
Power Management
Each system incorporates power management features that lower power consumption when there
is no activity detected from the keyboard, mouse, diskette drive, CD-ROM reader, or hard disk
drive after a pre-defined period of time. As soon as activity is detected the system resumes where
it left off.
When Power Management is enabled, the computer automatically activates power-saving features and enters a suspend mode whenever inactivity is sensed. The computer's power-saving
functions are as follows.
n Reduces the CPU clock speed
The CPU, cache, and video clock speeds are reduced, putting the computer in the
suspend mode.
n Blanks out the monitor
Puts the video controller into suspend mode. The vertical sync clock and blank signals
to the monitor are disabled.
n Forces the IDE devices into stand-by mode
n A suspend command is sent to the IDE devices which put the devices into a stand-by
mode.
I/O Addressing
The processor communicates with I/O devices by I/O mapping. The hexadecimal (hex)
addresses of I/O devices are listed in Table Section 1-3.
Table Section 1-3 I/O Address Map
Address (Hex) I/O Device Name
0000-000F DMA controller 1 (channel 0-3)
0200-0021 Interrupt controller 1
0400-0043 Timer 1
0408-004B Timer 2
0060 Keyboard controller byte
0061 NMI, speaker controller byte
0070, bit 7 Enable NMI
0070, bit 6:0 Real-time clock address
0071 Real-time clock data
Technical Information 1-9
Table Section 1-3 I/O Address Map
Address (Hex) I/O Device Name
0073 Reserved for system board configuration
0075 Reserved for system board configuration (read only)
0078 BIOS timer
0080-008F DMA page master
00A0-00A1 Interrupt controller 2
00C0-00DE DMA controller 2 (channel 4-7)
00F0 Reset numeric error
0170-0177 Secondary IDE channel
01F0-01F7 Primary IDE channel
0278-027B Parallel port 2
02F8-02FF Asynchronous communications port 2
0376 Secondary IDE channel command port
0377 Secondary IDE channel status port
0378-037F Parallel port 1
03BC-03BF Parallel port 2
03C0-03CF Video Graphics Array (VGA) compare registers
03E8-03EF Serial port 3
03FO-03F5 Diskette channel 1
03F6 Primary IDE channel command port
03F7 (write) Diskette channel command port
03F7, bit 7 Diskette change channel 1
03F7, bits 6:0 Primary IDE channel status port
03F8-03FF Asynchronous communications port 1
0CF8 PCI Configuration Space Enable
0CF9 Deturbo Mode Enable
C000-C0FF 8243LX configuration registers
C200-C2FF 823781B configuration registers
C300-C3FF Cirrus Video configuration registers
1-10 Technical Information
System Memory
The system comes standard with 8 MB of memory (16 MB in multimedia configurations),
640 KB of base memory and 7 MB of extended memory. System memory can be expanded up
to 128 MB, using optional single in-line memory modules (SIMMs) installed in SIMM sockets.
Four SIMM sockets are integrated on the system board. Non-multimedia systems ship with two
4-MB SIMMs installed in two sockets. Multimedia configurations ship with two 8-MB SIMMs
installed in two sockets.
The SIMM memory sockets accept 4-, 8-, 16-, 32-, or 64-MB SIMMs, either 32-bit (no parity) or 36-bit (parity). The factory installed high-speed RAM is 32 bits wide. SIMMs are 1 MB x
32 bit (4 MB), 2 MB x 32 bit (8 MB), 4 MB x 32 bit (16 MB), 8 MB x 32 bit (32 MB), and 16
MB x 32 bit (64 MB). When the standard SIMM(s) is removed, four 32-MB SIMMs may be
i nstalled for a total of 128 MB.
CAUTION: SIMMs must match the tin metal plating used on the system board SIMM sockets. When
adding SIMMs, use tin-plated SIMMs.
SIMMs install directly on the system board. Different size SIMMs may be intermixed.
Each SIMM is inserted into a socket or bank. The system board's four SIMM sockets are assigned as banks 0 through 3. For non-multimedia configurations, the standard 8 MB of memory is
installed in bank 0. The multimedia configurations have two 4 MB SIMMs installed in banks 0
and 1. See Section 3, Options, for installation instructions and SIMM memory configurations.
Interrupt Controller
The interrupt controller operates as an interrupt manager for the entire AT system envi ronment.
The controller accepts requests from peripherals, issues interrupt requests to the processor, resolves interrupt priorities, and provides vectors for the processor to determine which interrupt
routine to execute. The interrupt controller has priority assignment modes that can be reconfigured
at any time during system operations.
The interrupt levels are described in Table Section 1-4. Interrupt-level assignments 0 through 15
are in order of decreasing priority. See Section 2, Setup and Operation , for information on
chan ging the interrupts using Setup.
Table Section 1-4 Interrupt Level Assignments
Interrupt Priority Interrupt Device
IRQ00 Counter/Timer
IRQ01 Keyboard
Technical Information 1-11
Table Section 1-4 Interrupt Level Assignments
Interrupt Priority Interrupt Device
IRQ02 Cascade (INT output from slave)
IRQ03 COM2*
IRQ04 COM1*
IRQ05 Parallel Port 2
IRQ06 Diskette Drive Controller*
IRQ07 Parallel Port 1*
IRQ08 Real-time clock
IRQ09 Available
IRQ10 Available
IRQ11 Available
IRQ12 PS/2 mouse*
IRQ13 Coprocessor
IRQ14 Primary IDE
IRQ15 Secondary IDE
*Industry standard locations
Video Controller
The Circus Logic CLDG5434 PCI graphics controller combines powerful elements aimed at addressing the requirements of personal computer designs. State of the art techniques have been
added for optimizing performance in computer graphic intensive applications and graphical user
interfaces (GUI). A variety of industry standard 32-bit local bus interfaces are integrated on chip.
The key is that local bus interfaces are 32-bit wide.
Included in the video controller are cost saving features such as an integrated palette DAC and
clock synthesizer along with integrated support for multiple bus interfaces and flexible DRAMbased display memory configurations.
The TrueColor RAMDAC provides 24-bit true color. The integrated dual clock synthesizer allows full programmability of MCLK (memory clock) and PCLK (pixel clock). The integrated
clock synthesizer supports frequencies from 390 kHz to 120 MHz. The CLDG5434 supports up
to 2 MB of display memory. The video memory is 256K x 16 DRAM.
1-12 Technical Information
The VESA display power management signaling (DPMS) standard is supported, enabling standby, suspend, and off power saving modes. This includes the ability to independently stop
HSYNC or VSYNC and hold them at a static level. Additionally the RAMDAC may be powered-down and the clock frequencies lowered for further power savings. Color Key and video
overlay are supported for optional multimedia applications.
Video Memory
The 1 MB of on-board video DRAM is expandable to 2 MB and provides 640 x 480
resolutions with up to 16.8 million colors, 800 x 600 with up to 16.8 million colors,
1024 x 768 with up to 64 K colors, and 1280 x 1024 with up to 256 colors. Table Section 1-5
lists the resolutions available with the installed video memory.
Table Section 1-5 Video Resolutions and Frequencies
Resolution
640 x 480 1 MB 256 60 31.5
640 x 480 1 MB 256 72 37.0
640 x 480 1 MB 256 72 44.6
640 x 480 1 MB 65K 60 31.5
640 x 480 1 MB 65K 72 37.0
640 x 480 1 MB 65K 72 44.6
640 x 480 1 MB 16.7M 60 31.5
640 x 480 1 MB 16.7M 72 37.0
640 x 480 1 MB 16.7M 72 44.6
800 x 600 1 MB 256 95(i) 33.8
800 x 600 1 MB 256 56 35.2
800 x 600 1 MB 256 60 37.9
800 x 600 1 MB 256 70 44.5
800 x 600 1 MB 256 72 48.0
Memory
Required
Color
Video Clock (Hz) Horiz Sync (KHz)
800 x 600 1 MB 256 76 52.4
Technical Information 1-13
Table Section 1-5 Video Resolutions and Frequencies
Resolution
800 x 600 1 MB 65K 95(i) 33.8
800 x 600 1 MB 65K 56 35.2
800 x 600 1 MB 65K 70 44.5
800 x 600 1 MB 65K 72 48.0
800 x 600 2 MB 65K 76 52.4
800 x 600 2 MB 16.7M 95(i) 33.8
800 x 600 2 MB 16.7M 56 35.2
800 x 600 2 MB 16.7M 60 37.9
800 x 600 2 MB 16.7M 70 44.5
800 x 600 2 MB 16.7M 72 48.0
1024 x 768 1 MB 256 87(i) 35.5
1024 x 768 1 MB 256 60 48.4
1024 x 768 1 MB 256 66 53.9
1024 x 768 1 MB 256 70 56.1
Memory
Required
Color
Video Clock (Hz) Horiz Sync (KHz)
1024 x 768 1 MB 256 72 57.9
1024 x 768 1 MB 256 76 61.4
1024 x 768 2 MB 65K 87(i) 35.5
1024 x 768 2 MB 65K 60 48.4
1024 x 768 2 MB 65K 66 53.9
1024 x 768 2 MB 65K 70 56.1
1024 x 768 2 MB 65K 72 57.9
1024 x 768 2 MB 65K 76 61.4
1280 x 1024 1 MB 16 87(i) 50
1280 x 1024 1 MB 16 95(i) 50
1280 x 1024 2 MB 256 87(i) 50
1280 x 1024 2 MB 256 95(i) 50
1280 x 1024 2 MB 256 60 64.0
1280 x 1024 2 MB 256 70 74.6
1280 x 1024 2 MB 256 74 81.1
(I) Interlaced.
1-14 Technical Information
IDE/PCI-Bus Backboard
The desktop IDE/PCI-bus backboard provides three ISA expansion slots and one shared
IDE/PCI expansion slot. The backboard is plugged into the bus connector on the desktop system
board. The minitower PCI/IDE bus backboard provides three ISA expansion slots, one dedicated PCI expansion slot, and one shared IDE/PCI expansion slot. The backboard is plugged
into the bus connector on the minitower system board.
ISA Bus
The system board uses the ISA bus for transferring data between the processor and I/O peripherals and expansion boards. The ISA bus supports 16-bit data transfers and typically operates at
8 MHz. ISA expansion slot connector pin assignments are provided in
Appendix A.
PCI Local Bus
The industry-standard PCI-bus is a highly-i ntegrated I/O interface that offers the highest performance local bus available for the Pentium processor. The PCI-bus supports burst modes that send
large chunks of data across the bus, allowing fast displays of high-resolution im ages.
The high-bandwidth PCI-bus eliminates the data bottleneck found in traditional systems, maintains
maximum performance at high clock speeds, and provides a clear upgrade path to future
technologies. PCI expansion slot connector pin assignments are provided in Appendix A.
PCI Auto Configuration
The system comes with a PCI auto configuration utility that operates in conjunction with the system’s Setup utility. The utilities automatically configure interrupts, DMA channels, I/O space, and
other parameters to allow addition of PCI boards with minimal intervention.
Technical Information 1-15
Parallel Interface
The system has a 25-pin parallel port on the system board. Specifications for this port conform to
the IBM-PC standards.
The BIOS has automatic ISA printer port sensing. If the BIOS detects an ISA printer port
mapped to the same address, the built-in printer port is disabled. The BIOS also sets the first
parallel interface port it finds as LPT1 and the second port it finds as LPT2. The interrupt is selected to either IRQ5 or IRQ7 via the Setup and jumper settings.
Interrupt levels for the parallel port are given in Table Section 1-6. Software selectable base
addresses are 3BCh, 378h, and 278h.
Parallel interface signals are output through the system board's 25-pin, D-subconnector. The connector is located at the rear of the system unit. Pin locations for the parallel interface connector
are shown in Appendix A.
NOTE: Any interrupts used for the built-in
parallel port are not available for ISA parallel ports.
Table Section 1-6 Parallel Port Addressing and Interrupts
Starting I/O Address Interrupt Level Port
378 IRQ05 LPT1
278 IRQ05 LPT1 or LPT2
3BC IRQ05 LPT1 or LPT2
378* IRQ07 LPT1
278 IRQ07 LPT1 or LPT2
3BC IRQ07 LPT1 or LPT2
*Default for parallel port
Serial Interface
The system has two standard serial ports (COM1 and COM2). The serial ports support the
standard RS-232C interface (16550 compatible). I/O addresses and interrupt levels for the two
channels are given in Table Section 1-7. The interrupt is selectable via Setup to either IRQ3 or
IRQ4. Software selectable base addresses are 3F8h, 2F8h, 3E8h, and 2E8h. Serial interface signals are output through the system board's 9-pin, D-subconnector. The connectors are located at
the rear of the system unit. Pin locations for the serial interface connector are shown in Appendix
A.
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