The info rmat ion disclos ed in t his do cument , inclu ding all designs and r elat ed materials, is
the valuable pr opert y of NEC Cor p oration (NEC) and/or its licensors. NEC and/or its licensors, as appropriate, r eserve all pat ent, copyright and other proprietary rights to t his document, including all design, manufacturing, reproduction, use, and sales rights t heret o, except
to the extent said rights are expressly granted to others.
The NEC product(s) discussed in this document are warr anted in accordance with the terms
of the Warranty Statement accompanying each product. However, actual performance of
each such product is dependent upo n fact ors 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 applicat ions must be determined by the
customer and is not warranted by NEC.
To allow for design and specification impro vement s, t he information in this do cument is
subject to change at any time, without no tice. Reproduct ion of this document or po rtions
thereof without prior written approval of NEC is prohibited.
MultiSync and PowerMate are U.S. registered trademarks of NEC Technologies, Inc.
FastFacts is a U.S. trademark of NEC Technologies, Inc.
All other product, brand, or trade names used in this publication are the trademarks or registered
This service and reference manual contains the technical information necessary to set up,
maintain, troubleshoot, and repair the NEC PowerMate V series computer systems. It 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 engineers, 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, internal devices and system unit specifications.
Section 2, Setup and Operation, gives general setup and operation information. Included
is a description of the system Setup utility and the factory default configuration settings. A
procedure is provided for logging onto the NEC Bulletin Board and obtaining the latest
Flash ROM BIOS.
Section 3, Options, provides safety precautions and installation procedures for installing
options.
Section 4, Maintenance and Troubleshooting, includes a list of NEC service information
and telephone numbers that provide access to the NEC Bulletin Board System (BBS),
FastFacts, and Technical Information Bulletins. Recommended maintenance information
and solutions to possible problems that may occur, are also provided.
Section 5, Desktop Repair, provides desktop disassembly and reassembly procedures
along with an illustrated parts breakdown. NEC service and spare parts ordering
information is also provided.
Section 6, Minitower Repair, provides 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 board’s internal
connector pin assignments and a list of external pin assignments for the keyboard/mouse,
serial port, parallel port, and video port.
Appendix B, System Board Jumpers, provides jumper information for configuring the
system for a particular requirement.
Appendix C, Hard Disk Drive Specifications and Jumper Settings, provides
specifications and jumper settings for the hard disk drives that ship with the PowerMate V
series systems.
Appendix D, CD-ROM Reader Specifications and Jumper Settings, provides
specifications and jumper settings for the CD-ROM readers that ship with the PowerMate V
series systems.
xvi Preface
Abbreviations
xvii
Aampere
ACalternating current
ATadvanced technology (IBM PC)
BBSBulletin Board System
BCDbinary-coded decimal
BCUBIOS Customized Utility
BIOSbasic input/output system
bitbinary digit
BUUBIOS Upgrade Utility
bpibits per inch
bpsbits per second
Ccapacitance
Ccentigrade
Cachehigh-speed buffer storage
CAMconstantly addressable memory
CAScolumn address strobe
CD-ROMcompact disk-ROM
CGAColor Graphics Adapter
CGBColor Graphics Board
CHchannel
clkclock
cmcentimeter
CMOScomplementary metal oxide
semiconductor
COMcommunication
CONTcontrast
CPGAceramic pin grid array
CPUcentral processing unit
DACdigital-to-analog converter
DACKDMA acknowledge
dbdecibels
DCdirect current
DIPdual in-line package
DMAdirect memory access
DMACDMA controller
DOSdisk operating system
DRAMdynamic RAM
ECCerror checking and correction
ECPenhanced capabilities port (ECP)
EGAEnhanced Graphics Adapter
EPPEnhanced Parallel Port
EPROM erasable and programmable ROM
EVGAEnhanced Video Graphics Array
FFahrenheit
FAXfacsimile transmission
FCCFederal Communications Commission
FGframe ground
FIFOfirst-in/first-out
FMfrequency modulation
FRUfield-replaceable unit
GBgigabyte
GNDground
HEXhexadecimal
HGAHercules Graphics Adapter
Hzhertz
ICintegrated circuit
IDidentification
IDEintelligent device electronics
in.inch
IPBillustrated parts breakdown
ISAIndustry Standard Architecture
I/Oinput/output
IPCintegrated peripheral controller
ipsinches per second
IRinfrared
IRQinterrupt request
Kkilo (1024)
kkilo (1000)
KBkilobyte
kgkilogram
kHzkilohertz
lbpound
LEDlight-emitting diode
Mmega
xviii Abbreviations
mAmilliamps
maxmaximum
MBmegabyte
MDAMonochrome Display Adapter
MFMmodified frequency modulation
MHzmegahertz
MICmicrophone
MIDImusical instrument device interface
MPCmultimedia PC
mmmillimeter
MPEGMotion Picture Experts Group
msmillisecond
NASCNational Authorized Service Center
NCnot connected
NMINon-maskable Interrupt
nsnanosecond
NSRC National Service Response Center
PALprogrammable array logic
PCpersonal computer
PCIPeripheral Component Interconnect
PDApersonal digital assistant
PFPplastic flat package
PIOparallel input/output
pixelpicture element
PROMprogrammable ROM
RAMrandom-access memory
RAMDAC RAM digital-to-analog converter
RGBred green blue
RGBIred green blue intensity
ROMread-only memory
rpmrevolutions per minute
Rread
RTCreal-time clock
R/Wread/write
Sslave
SCSISmall Computer System Interface
SGsignal ground
SIMMsingle inline memory module
SVGASuper Video Graphics Array
SWswitch
TACTechnical Assistance Center
TSCTechnical Support Center
TTLtransistor/transistor logic
tpitracks per inch
Vvolt
Vacvolts, alernating current
Vdcvolts, direct current
VESAvideo electronics standards
association
VGAVideo Graphics Array
VRAMvideo RAM
Wwatt
Wwrite
Section 1
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Technical Information
The PowerMate® V Series of desktop and minitower systems come standard with an Intel
Pentium™ processor, a 3 1/2-inch 1.44 megabyte (MB) diskette drive, 256 kilobyte (KB)
secondary cache, 8- or 16-MB random access memory (RAM), and 1 MB of video dynamic
random access memory (DRAM).
The first release of the PowerMate V system configurations are listed in Table 1-1. See
Table 1-2 for the PowerMate V configurations released in March of 1996.
Table 1-1 First Release of System Configurations
Configurations
Diskless 3 1/2-Inch diskette
Hard disk system 3 1/2-inch diskette drive
Network-read
system
Multimedia 3 1/2-inch diskette drive
PowerMate V75
(75 MHz)
drive onl
8 MB of RAM
540 MB hard disk
with 8 MB of RAM
or
1.2 GB hard disk
with 16 MB of RAM
3 1/2-inch diskette drive
1.2 GB hard disk
Network board
8 MB of RAM
1.2 GB hard disk
quad-speed CD-ROM
reader
stem board w/audio
S
16 MB of RAM
Speakers
Microphone
PowerMate V90
(90 MHz)
Not available Not available
3 1/2-inch diskette drive
540 MB hard disk
with 8 MB of RAM
or
1.2 GB hard disk
with 16 MB of RAM
3 1/2-inch diskette drive
1.2 GB hard disk
Network board
8 MB of RAM
3 1/2-inch diskette drive
1.2 GB hard disk
quad-speed CD-ROM
reader
stem board w/audio
S
16 MB of RAM
Speakers
Microphone
PowerMate V100
(100 MHz)
3 1/2-inch diskette drive
540 MB hard disk
with 8 MB of RAM
or
1.2 GB hard disk
with 16 MB of RAM
3 1/2-inch diskette drive
1.2 GB hard disk
Network board
8 MB of RAM
3 1/2-inch diskette drive
1.2 GB hard disk
quad-speed CD-ROM
reader
stem board w/audio
S
16 MB of RAM
Speakers
Microphone
1-2 Technical Information
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Table 1-2 Second Release of System Configurations
Configurations
Hard disk system 3 1/2-inch diskette drive
Network-read
system
(desktops only)
Multimedia 3 1/2-inch diskette drive
PowerMate V75
(75 MHz)
850 MB hard disk
with 8 MB of RAM
or
1.6 MB hard disk
with 16 MB of RAM
3 1/2-inch diskette drive
850 MB hard disk
Network board
8 MB of RAM
1.6 GB hard disk
six-speed CD-ROM
reader
stem board w/audio
S
16 MB of RAM
7 W Speakers
Microphone
PowerMate V100
(100 MHz)
3 1/2-inch diskette drive
850 MB hard disk
with 8 MB of RAM
or
1.6 MB hard disk
with 16 MB of RAM
3 1/2-inch diskette drive
850 MB hard disk
Network board
8 MB of RAM
3 1/2-inch diskette drive
1.6 GB hard disk
six-speed CD-ROM
reader
stem board w/audio
S
16 MB of RAM
7 W Speakers
Microphone
PowerMate V133
(133 MHz)
3 1/2-inch diskette drive
850 MB hard disk
with 8 MB of RAM
or
1.6 MB hard disk
with 16 MB of RAM
3 1/2-inch diskette drive
850 MB hard disk
Network board
8 MB of RAM
3 1/2-inch diskette drive
1.6 GB hard disk
six-speed CD-ROM
reader
stem board w/audio
S
16 MB of RAM
8 W Speakers
Microphone
Each system incorporates power management features, and has factory installed software to
enhance the hardware features. Systems come with a dual operating system requiring that
either Microsoft® Windows for Workgroups™ or Windows 95™ be selected when the
system is first powered on.
The following paragraphs give an overview of the desktop and minitower systems.
Differences between systems are noted as they occur.
Technical Information 1-3
DESKTOP SYSTEM CHASSIS
The desktop chassis provides an enclosure for the system board, power supply, four
expansion slots, a five-connector PCI/ISA backboard, and four storage device slots. The
expansion slots include two 8-/16-bit ISA slots, one dedicated 32-bit PCI slot, and one
shared PCI/ISA (32-bit PCI or 8-/16-bit ISA) slot. For network-ready configurations, one
slot has a network board installed and the remaining slots are open.
The four storage device slots accommodate up to three accessible devices and one internal
hard disk drive device. The accessible devices include the standard one-inch high 3 1/2-inch
1.44-MB diskette drive and up to two 1.6-inch high 5 1/4-inch storage devices. The nonmultimedia hard disk systems ship with an accessible 3 1/2-inch diskette drive and an
internal 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 an accessible 3 1/2-inch
diskette drive, an internal 3 1/2-inch hard disk drive, and an accessible 5 1/4-inch CD-ROM
reader, leaving one accessible 5 1/4-inch storage device slot available for an optional device.
Figure 1-1 shows front panel features and locations of the accessible storage devices in a
desktop system. Multimedia systems come with a CD-ROM reader installed in the top
accessible device slot.
3 1/2-Inch
Diskette Drive
IR Window
System Controls
and Lamps
3 1/2-Inch Internal
Hard Drive Slot
(behind panel)
5 1/4-Inch Accessible
Dev ice Slot s
Figure 1-1 Desktop System Controls and Storage Device Slots
Power Button
1-4 Technical Information
MINITOWER SYSTEM CHASSIS
The minitower chassis provides an enclosure for the system board, power supply, five
useable expansion slots, a six-connector PCI/ISA backboard, and seven storage device
slots. The expansion slots include three 8-/16-bit ISA slots, one shared PCI/ISA slot, and
one 32-bit PCI slot. For network-ready configurations, one slot has a network board
installed and the remaining slots are open.
The seven storage device slots accommodate up to four accessible devices and three
internal hard disk drive devices. The accessible devices include the standard one-inch high
3 1/2-inch 1.44-MB diskette drive and up to three 1.6-inch high 5 1/4-inch storage devices.
The internal device slots support up to three 3 1/2-inch hard disks; one in the standard front
slot. The other two install into a drive bracket that ships with the system. The bracket
attaches to the inside rear of the system.
The non-multimedia hard disk systems ship with an accessible 3 1/2-inch diskette drive and
an internal 3 1/2-inch hard disk drive, leaving three accessible 5 1/4-inch storage device
slots and two internal slots available for optional devices. The multimedia systems ship with
an accessible 3 1/2-inch diskette drive, an internal 3 1/2-inch hard disk drive, and an
accessible 5 1/4-inch CD-ROM reader, leaving two accessible 5 1/4-inch storage device
slots and two internal slots available for optional devices.
Figure 1-2 shows the front panel features and the locations of the accessible storage devices
in a minitower system. Multimedia systems come with a CD-ROM reader installed in the
top accessible device slot.
Power Button
System Controls
and Lamps
IR Window
3 1/2-Inch Internal
Hard Drive
(behind cover)
Figure 1-2 Minitower System Controls and Storage Device Slots
3 1/2-Inch Internal
Hard Disk Slots
(behind cover)
3 1/2-Inch
Diskette Drive
5 1/4-Inch
Accessible Device
Slots
SYSTEM BOARD
Key features of the system board include the following:
Intel Pentium 75-, 90-, 100-, or 133-MHz Pentium processor, depending on
system configuration
16-KB internal dual write-back cache integrated on the processor
256-KB write-back secondary static random access memory (SRAM)
accelerator and motion video playback controller using Alliance
ProMotion-6422™
standard 1-MB (two 256K x 16) video DRAM, expandable to 2 MB
standard 1-MB video DRAM supports resolutions of 640 x 480 with up to
16.8 million colors, 800 x 600 with up to 64K colors, 1024 x 768 with up to
256 K colors, and 1280 x 1024 with up to 16 colors
1-6 Technical Information
integrated sound (multimedia configurations only)
OPTi Sound Blaster compatible chip on system board
Yamaha OPL3 FM synthesis chip on system board
built-in 16-bit stereo and FM synthesis
Wavetable sound upgradeable
3D sound effects
two intelligent drive electronics (IDE) interface channels
one fast IDE/PCI channel (primary connector) used by the hard disk drive to
transfer data at the hard disk’s optimum rate
one standard IDE channel (secondary connector) for the CD-ROM reader
supports up to four IDE devices, two to each channel
power management for placing system in power save mode when idle for a
specified amount of time
3 1/2-inch, 1.44-MB diskette drive standard all configurations
PCI/ISA backboard configurations
desktop provides four expansion slots: two ISA, one PCI, and one shared
ISA/PCI connectors
minitower provides five expansion slots: three ISA, one PCI, and one shared
ISA/PCI connectors
external connectors for connecting the following external devices:
VGA-compatible monitor (standard, super, high-resolution VGA)
personal system/2 (PS/2®)-style mouse
PS/2-style keyboard
bidirectional Enhanced Parallel Port (EPP) and enhanced capabilities port
(ECP) are supported for a parallel printer
serial devices through two buffered 16C550 UART serial ports, each
supporting up to 19.2 KB per second
external speakers, microphone, and headphone connectors (multimedia
configurations only)
Technical Information 1-7
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MIDI/joystick connector on the system board for installation of an optional
MIDI/joystick kit
Audio Wave upgrade connector on the system board for installation of an optional
Wave upgrade.
Table 1-3 lists the major chips on the system board. See Appendix A, Connector Pin
Assignments, for a list of the system board connectors. See Appendix B, System Board
Jumpers, for a description of board jumpers.
Intel Triton 82430FX PCI/ISA Chip Set
82437FX
82438FX
824371FB
SMC FDC37C935 or 665 Integrated Plug and Play Ultra I/O controller
Alliance ProMotion-6422 PCI GUI graphics controller
28F001 128k x 8 Flash ROM
Dallas DS12887/MC146818
or
Toshiba CR2032 Coin Cell Battery
OPTi 82C930 Sound Chip
(multimedia systems only)
Yamaha OPL3-L Synthesizer Chip
(multimedia systems only)
stem controller
S
Data path unit
PCI ISA/IDE accelerator bridge chip
Real-time clock/batter
or
3 Volt Lithium CMOS battery (SMC 935)
Onboard PC sound system
Frequency modulated synthesizer
(SMC 665)
Processor
The PowerMate V series of computers use the following Pentium processors:
PowerMate V75 — 75-MHz processor with internal speed of 75 MHz and
external speed of 50 MHz.
PowerMate V90 — 90-MHz processor with internal speed of 90 MHz and
external speed of 60 MHz
1-8 Technical Information
PowerMate V100 — 100-MHz processor with internal speed of 100 MHz and
external speed of 66 MHz.
PowerMate V133 — 133-MHz processor with internal speed of 133 MHz and
external speed of 66 MHz.
Each processor has 16 KB of write-back primary cache and a math coprocessor. The 16 KB
primary cache provides 8 KB for instructions and 8 KB for data.
The processor is an advanced pipelined 32-bit addressing, 64-bit data 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 asynchronous pipelined 256-KB secondary cache.
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 zero insertion force (ZIF) socket. The socket provides an upgrade path to the
next generation processor.
Secondary Cache
The system board contains 256 KB of secondary cache, external to the processor. The first
release shipped uses 15-ns asynchronous SRAM (PowerMate V90 and V100) or 20-ns
asynchronous SRAM (PowerMate V75) cache. The second release of the PowerMate V
series ships with 15-ns synchronous pipe line burst cache.
Cache allows data to be sent or received from cache with one wait state burst. Cache
memory improves read performance 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.
System and Video BIOS
The system and video BIOS are stored in a 1 MB (128 KB by 8) flash memory device
(Flash ROM). The system BIOS uses 64 KB, the video BIOS uses 32 KB, and 32 KB is
reserved. The system BIOS is capable of being shadowed and cached through the system’s
Setup utility (see Section 2 for Setup information). System BIOS is write protected and
automatically enabled.
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 system BIOS also contains the Setup utility. The hardware setup default
copies the ROM BIOS into RAM (shadowing) for maximum performance.
Technical Information 1-9
The Flash ROM allows the system and video BIOS to be upgraded with the BIOS Update
utility, without removing the ROM (see Section 2 for further information on the BIOS
Update utility). The Flash ROM supports the reprogramming of the system BIOS and the
video BIOS.
The system memory map is provided in Table 1-4.
Table 1-4 System Memory Map
Memory Space Size Function
00000000-0009FFFF 640 KB Conventional base memory
000A0000-000BFFFF 128 KB Video buffer
000C0000-000C7FFF 32 KB Video BIOS
000C8000-000EFFFF 160 KB Expansion
000F0000-000FFFFF 64 KB System BIOS
00100000-00EFFFFF 14 MB Cacheable
00F00000-00FFFFFF 1 MB Optional memory space
01000000-03FFFFFF 48 MB Always cacheable
04000000-07FFFFFF 64 MB L1 cache only
FFF80000-FFFFFFFF 512 KB BIOS ROM
System Memory
Non-multimedia systems come standard with 8 MB of memory: 640 KB of base memory
and 7 MB of extended memory. All multimedia, 1.2 GB, and 1.6 GB hard disk
configurations come standard with 16 MB of memory: 640 KB of base memory and 15 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 on the system board.
Four SIMM sockets are integrated on the system board. Non-multimedia systems ship with
two 4-MB SIMMs (8 MB total) installed in two sockets. The multimedia, 1.2 GB, and 1.6
GB hard disk configurations ship with two 8-MB SIMMs (16 MB total) installed in two
sockets.
The SIMM memory sockets accept 32-bit (non-parity) 4-, 8-, 16-, or 32-MB 70 ns SIMMs.
The SIMMs are 1 MB x 32 bit (4 MB), 2 MB x 32 bit (8 MB), 4 MB x 32 bit (16 MB), and
8 MB x 32 bit (32 MB). When the standard SIMMs are removed, four 32-MB SIMMs may
be installed 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.
1-10 Technical Information
SIMMs install directly in the four sockets on the system board. The four sockets are
assigned as SIMM 1 through SIMM 4. For non-multimedia configurations, the two
standard 4 MB SIMMs are installed in SIMM 1 and SIMM 2. For multimedia
configurations, the two standard 8 MB SIMMs are installed in SIMM 1 and SIMM 2.
SIMMs must be installed in pairs of the same memory type. Jumpers are not required to set
memory size or type as the system BIOS automatically detects the SIMMs. SIMM banks 1
and 2 must always be filled for the system to operate. Table 1-5 shows the SIMM memory
upgrade path.
The system has an Alliance ProMotion-6422 PCI local bus motion video playback
controller and graphics accelerator integrated on the system board. State of the art
techniques are used for optimizing performance in computer graphic intensive applications
and graphical user interfaces (GUI).
The integrated graphics controller integrates a motion video controller, a high-performance
GUI accelerator, 24-bit high frequency DAC and clock generator, VESA®-compliant
feature connector, and 1 MB of fast 64-bit DRAM (upgradeable to 2 MB).
Motion Video Controller
The motion video controller integrates a powerful Windows® GUI engine and unique
motion video playback hardware for superior performance. The graphics engine includes an
on-chip color space converter to accelerate decompression and a hardware scaler to scale
continuously from native size up to full screen at full speed. The graphics engine delivers a
full screen, smooth display of motion video data up to 30 frames per second (fps). Support
includes MPEG-1 and Video for Windows.
MPEG is a compression/decompression standard developed by the Motion Picture Experts
Group. MPEG produces full-screen 30 fps, broadcast-quality digital video. The video
controller architecture maximizes the motion video performance and removes bandwidth
bottlenecks to display multimedia data at its full speed.
Graphics Accelerator
The graphics accelerator is specifically designed for graphics-intensive operations, text and
color pixel amplification, and scrolling. The graphics accelerator provides 64-bit, ultra-high
performance for demanding True Color, High Color, and pseudocolor GUI and CAD
applications.
The accelerator minimizes bus traffic by off-loading the tasks normally performed by the
processor. The dedicated bit-block transfers (BitBLT) engine maximizes performance by
speeding the movement of large blocks of image data in video memory.
Video Memory
The system comes with 1 MB of on-board video DRAM, upgradeable to 2 MB. The
standard 1 MB DRAM consists of two 256K by 16 DRAM devices soldered to the system
board. The optional 1 MB of DRAM consists of two 256 KB by 16 modules that install in
two sockets on the system board.
1-12 Technical Information
With the standard 1 MB of video DRAM, the video hardware supports the following
resolutions, colors, and refresh rates:
1280 by 1024 pixels, 16 colors, 60 Hz
1024 by 768 pixels, 16/256 colors, 60 Hz, 66 Hz, 70 Hz, 72 Hz, and 75 Hz
800 by 600 pixels, 16/256/64K colors, 56 Hz, 60 Hz, 72 Hz, and 75 Hz
640 by 480 pixels, 16/256/64K/16.8 million colors, 60 Hz, 72 Hz, and 75 Hz.
With 2 MB of video DRAM, the system supports the following additional resolutions,
colors, and refresh rates:
1600 by 1200 pixels, 16/256 colors, 60 Hz and 70 Hz
1280 by 1024 pixels, 256 colors, 60 Hz, 72 Hz, and 75 Hz
1024 by 768 pixels, 64K colors, 60 Hz, 66 Hz, 70 Hz, 72 Hz, and 75 Hz
800 by 600 pixels, 16.8 million colors, 56 Hz, 60 Hz, 72 Hz, and 75 Hz.
Interrupt Controller
The interrupt controller operates as an interrupt manager for the entire AT system
environment. 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.
Technical Information 1-13
The interrupt levels are described in Table 1-6. Interrupt-level assignments 0 through 15 are
in order of decreasing priority. See Section 2, Setup and Operation, for information on
changing the interrupts using Setup.
Table 1-6 Interrupt Assignments
Interrupt
Priority
IRQ00 Counter/Timer
IRQ01 Keyboard
IRQ02 Cascade (INT output from slave)
IRQ03 COM2 and COM4
IRQ04 COM1 and COM3
IRQ05 Parallel Port 2/Audio (if present)
* Network and multimedia configurations use one of the these
interrupts.
1-14 Technical Information
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 1-7.
Table 1-7 I/O Address Map
Address (Hex) I/O Device Name
0000-000F DMA controller 1 (channel 0-3)
0020-0021 Interrupt controller 1
0040-0043 Timer 1
0048-004B Timer 2
0061 NMI status and control
0064 Keyboard controller byte
0070-007F Real-time clock, NMI mask
0080-008F DMA page registers
00A0-00A1 Interrupt controller 2
00C-00DE DMA controller 2
00E0-00EF Reserved
00F0 Clear math coprocessor error
00F1 Reset math coprocessor
0F8-0FF Math coprocessor
170-177 Secondary hard disk controller
1F0-1F7 Primary hard disk controller
200-207 Game I/O
220-22F Sound port
238-23F Serial port 4 (used for remapping)
278-27F Parallel port 2
2B0-2DF Alternate EGA adapter
2F8-2FF Serial port 2
338-33F Serial port 3 (used for remapping)
378-37F Parallel port 1
3B0-3BF Mono display and printer adapter
3C0-3CF EGA adapter
3D0-3DF CGA adapter
3F0-3F7 Primary diskette drive controller
3F8-3FF Serial port 1
CF8-CFF PCI configuration
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