Intel Pentium OverDrive User manual

486 TM

3
Part Number: 351599-005
Copyright © 1996 Intel Corporation. All rights reserved.
Intel Corporation
5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
Intel Corporation assumes no responsibility for errors or omissions in this
guide. Nor does Intel make any commitment to update the information
herein.
*All other brand and product names are trademarks of their respective
owners. First Edition July 1994
Second Edition April 1995
Third Edition September 1995
Fourth Edition January 1996
Fifth Edition July 1996

4
This symbol indicates a CAUTION or
WARNING. These are operations or
situations that may be harmful or
dangerous to you or your equipment.
All cautions and warnings should be
read and observed.
Explanation of symbols used in this guide:
This symbol indicates a NOTE. Notes
areitemsofspecialinterestthatpertain
to the section or procedure you are
reading. Notes typically clarify or
augment the material in the text.
Introduction.................................................................................... 4
Before You Begin... ....................................................................... 4
Installation...................................................................................... 5
Demonstration and Diagnostics Diskette .................................... 19
Troubleshooting ........................................................................... 20
Getting Help................................................................................. 28
Warranty....................................................................................... 30
Appendix A .................................................................................. 32
Contents
Serial Number: P240076

5
• the layout of any components or empty
sockets. Do the sockets have handles?
• the size of any components or empty
sockets. Youmust have a socket large
enough to fit the Pentium OverDrive
processor. In order to install the
Pentium OverDrive processor, you
must havea 237or238 pinsocket. See
page 10 for details.
Introduction
Congratulations on your purchase of a PentiumOverDriveprocessor!
The Pentium OverDrive processor for Intel486™processor-based systems is
a single chip processor upgrade for systems based on Intel486SX, Intel486
SX2™, Intel486 DX, and Intel486 DX2™processors, and makes all software
run faster on existing systems.
BeforeYou Begin...
This section provides instructions you should read before starting the Pentium
OverDrive processor installation.
On most computers, installing the Pentium OverDrive processor is simple if
you carefully follow the directions in your computer owner's manual and in
this manual. Before starting the installation process, we recommend you take
a few moments to:
• familiarize yourself with the appearance of your system's layout.
• read through the entire Installation section of this manual to fully
understand the process.
Your System's Layout
If you have not previously viewed your system's layout, at this point you may
wish to unplug your system, remove the cover and familiarize yourself with
the appearance of your system's components before continuing. Look for:
• the general appearance of your motherboard (the large board in
the bottom of your computer to which all other components are
attached). Are there cards or cables
near or attached to your motherboard?
Your system must
have a 237 or 238-pin
socket

6
Step 1 - Install the diskette software and view
the animated demo.
Intel includes a Demonstration and Diagnostics Diskette with your Pentium
OverDrive processor. The diskette contains two portions:
•ademonstration to guide you through the Pentium OverDrive
processor installation procedure.
• diagnostics to test your Pentium OverDrive processor for
proper installation and operation.
To view the demo, your computer must be equipped with a VGA video board
and monitor, and you need to install the diskette software on your system.
Installing the software program to view the demo also
places the diagnostic utilities on your hard disk. Intel
provides you with a utility to remove the diskette
software from your hard disk once you have completed
your Pentium OverDrive processor installation and
diagnostics. For more information on this utility or on
the diagnostic software, see the section Demonstration
and Diagnostics Diskette.
Installing the Diskette Software
You can use DOS* or Windows* to install the software on the diskette. The
full set of utilities takes 1.1 MB on your hard disk if you install it using DOS
and 1.2 MB if you install it using Windows. If you install the software from
DOS,youareaskedifyouwishtoapprovemodificationoftheAUTOEXEC.BAT
file. Intel recommends that you choose OK.
The installation program also asks you if you wish to only install the Fan
Monitor portion of the diagnostic software. If you want to install the fan test
software to your hard drive but do not desire the demonstration or post-install
diagnostics, choose this option.

7
To install the software on your hard disk, insert the diskette in drive A and:
For DOS users type: a:\install e
For OS/2* or Windows NT*
users type from a DOS prompt: a:\install e
For Windows users: In the Program Manager, select: FILE
and then select: RUN
On the Command Line, type: a:setup
and click OK
For Windows 95 users: From the task bar, select Start
From the Start menu, select Run
and at the prompt type:
\SETUP
To begin the demonstration after installing the software:
For DOS users: Go to the odp_util directory and type:
overdriv e
For Windows NT users : Go to the odp_util directory and
type from a full-screen DOS prompt:
overdriv e
For Windows users: Double click the icon “OverDrive
Processor Demo/Diagnostics”
For OS/2 users: Ensure that the following line ap-
For more information, pears in your config.sys file:
refer to Troubleshooting VME=NO
section, p. 26. Ensure that the settings for your DOS
full-screen command prompt in-
cludes the following:
HW_TIMER set to ON
From a full-screen DOS prompt type:
overdriv e
For Windows 95 users: Press e or click OK
When the Main Menu appears, select "Installation Demonstration." If instal-
lation sounds complicated after viewing the installation demo and after
reading through the installation sections of this manual, have a qualified
technician install the Pentium OverDrive processor for you.

8
Step 2- Ground yourself, then unplug computer
and remove cover.
To prevent damage from static discharge to the Pentium OverDrive processor
and to your computer, touch the metal back or side panel of your computer’s
system unit to ground yourself. Then, turn off the computer and any attached
equipment (such as a printer), unplug the power cord, and remove the cover
from the computer.
Warning:DangertoEquipment! ThePentium
OverDriveprocessorcanbedamagedbystatic
discharge. Be sure to ground yourself before
handling the Pentium OverDrive processor by
touchingthemetalon yourcomputer. Limiting
your movements during installation reduces
static electricity.
If installation sounds risky, have a qualified
technician install the Pentium OverDrive pro-
cessor. If you make a mistake, you could
damage the Pentium OverDrive processor,
damage your computer, or injure yourself. If
youinstall it yourself,follow theseinstructions
exactly.

9
Step 3 - Find the socket in which you will install
the Pentium OverDrive processor.
The socket in which you install your Pentium OverDrive processor may be
on your motherboard or removable processor card, and is near the Intel486
processor. If there is no specific Pentium OverDrive processor socket, you
must remove the original processor and install the Pentium OverDrive
processor in that socket.
If your system contains an Intel487™SX math
coprocessor, you must remove that component and
install the Pentium OverDrive processor in that socket.
The processor can appear in various forms. Your computer may have a
surface-mounted processor or a socketed processor, and the processor may
have a heat sink attached. However, the dimensions of the original processor
are similar to those of the Pentium OverDrive processor. Your computer
owner's manual may contain location information for the processor. If you
cannot locate the processor, contact your dealer or your computer manufac-
turer for assistance.
Socketed
Processor
Motherboard
Motherboard
Intel486 SX or DX
Processor
OverDrive
processor
socket
Surface-mounted
Processor Processor with heat sink attached
PC-2597a
486
Removable
Processor card

10
Once you locate the processor, look in the immediate area to determine
whether or not your system has an empty socket specifically dedicated for the
Pentium OverDrive processor.
A Quick Word About Socket Types
There are several types of Pentium OverDrive processor sockets. You must
determine which socket type you have in order to successfully insert your
Pentium OverDrive processor.
Two common variations are the Zero Insertion Force (ZIF) socket and Low
Insertion Force (LIF) socket.
As the illustration shows, you can identify a ZIF socket type by the handle
which locks/unlocks to allow placement of the Pentium OverDrive processor.
LIF sockets do not have a handle, as shown.
handle
PC-1700 PC-1701
Typical Sockets With Handle (ZIF Sockets)
Note variations in pin hole layout
Typical Socket Without Handle (LIF Socket)

11
Match your computer's socket layout to one shown in the chart, then proceed
to the indicated step in this manual.
486
RemovetheIntel486processorandinstallthePentium
OverDrive processor in the Intel486 processor socket. If
the Intel486 processor is not surrounded by an empty
row of pins, you cannot install the Pentium OverDrive
processor.
19 pinholes
per side
PC-1702
Empty Weitek socket beside Intel486 processor—go to Step 4.
Not an OverDrive processor socket! For
Weitek coprocessors only! Remove the
Intel486processorandinstall thePentium
OverDrive processor in the Intel486
processor socket. If the Intel486 processor
is not surrounded by an empty row of
pins, you cannot install the Pentium
OverDriveprocessor.
15 pinholes
per side
i487
TM
Removethe Intel487 SX math coprocessor
and install the Pentium OverDrive processor
in the Intel487 processor socket. If the math
coprocessor is not surrounded by an
empty row of pins, you cannot install the
PentiumOverDriveprocessor.
If your processor is soldered to the motherboard in a surface
mount, and you do not have a separate 237 or 238 pinhole
Pentium OverDrive socket, you cannot install the Pentium
OverDrive processor. Do not attempt to remove the
originalprocessor!
No empty Pentium OverDrive processor socket—go to Step 4.
Empty socket beside Intel486 processor—go to Step 5.
Pentium OverDrive processor socket with Intel487 SX math
coprocessor installed—go to Step 4. (Intel486 SX processor
systems only)
Surface-mounted processor only—not compatible!
Possible System Layouts
If the empty socket does not contain 237
or 238 pinholes (19 pinholes per side),
you cannot install the Pentium OverDrive
processor.
486

12
Step 4- For computers without an empty
Pentium OverDrive processor socket only.
Remove the existing processor from the
socket.
Removing the processor from a socket with a handle
If the processor is in a socket with a handle, open the socket by moving the
handle completely to a 90° upright position. Be sure the socket is completely
open.
Very little force is required to open the socket handle. Do not use excessive
force. Your computer’s motherboard should not bend while opening the
socket. Once the socket is open, remove the processor.
Be sure the socket handle is completely open.
486
PC-2637
Make a sketch to
help recall how the
original processor is
oriented.
Before removing the processor, make note of how its notched corner is
oriented in the socket (make a sketch, if necessary). You need to install the
Pentium OverDrive processor with exactly the same orientation.

13
Removing the processor from a socket with no handle
Place the notch at a corner of the processor and insert between the processor
and socket. Rock the handle from side to side to lift the corner slightly. Once
a small gap appears between the chip and socket, move to the next corner.
Push inward on the processor removal tool’s handle to gently ease the
processor from its socket. Gradually loosen one side at a time. Loosen all
four sides evenly and remove the processor. Be sure to push the handle
towards the chip as shown.
2. Continue until all the
corners are loose and you
can insert the rake part of
the tool along the side of
the processor, between
processor and socket. Be
sure to push the handle
toward the processor.
Do not push the handle
away from the processor.
1. Loosen each corner of the proces-
sor by carefully inserting the notched
handle of the removal tool between
the bottom side of the processor and
its socket as shown. Rock the handle
from side to side to loosen the
processor. Fit the rake
tines between
processor
pins
Heatsink
Processor (gray layer )
Socket (white, black or blue)
Push handle
toward
processor
Now proceed to Step 5.
FindthechipremovaltoolinthePentium
OverDrive processor package. The tool
resembles a tiny garden rake with a
notch in the end of the handle. Removal tool

14
PC-2682
Correctly orienting your Pentium OverDrive processor in the socket is crucial
to the success of your installation. Note that failure to correctly align your
Pentium OverDrive processor may result in damage to the chip or your
system. Before inserting the Pentium OverDrive processor into the socket,
take a moment to read through this step.
Regardless of your system layout and the socket type, there are clues to help
you correctly orient your Pentium OverDrive processor in the socket. If you
removed a processor in order to install the Pentium OverDrive processor, you
can refer to the sketch you made in Step 4 for the correct orientation.
Some sockets contain a key pin hole, an additional hole in one corner of the
inside pin hole row. The key pin hole corner serves as a landmark for you to
match the corresponding corner of the Pentium OverDrive processor which
contains a blunt edge and different pin arrangement as shown.
Step 5- Orient and insert the Pentium OverDrive
processor.
Aligning Pentium OverDrive
Processor in Socket with Key
Pin Hole
Line up processor corner
containing blunt edge and
distinctive pin arrangement to
key pin hole corner on socket
Key pin hole
Distinctive pin
arrangement

15
PC-1702
PC-1701
Key Pin Hole
If your Pentium OverDrive processor socket does not have a key pin hole
corner, you must look for other alignment clues. Carefully inspect the socket
and the area around it. Some visual clues you may see include:
• a blunt edge on either an inside or outside corner of the socket
• a blunt edge in a silkscreened socket outline on the motherboard
• a socket corner which is a different shade or contains a mark not
found on any of the other socket corners
• a mark which is silkscreened on the motherboard by one socket
corner
• an extra pin hole on the outside pin hole row
• a corner with a pin hole arrangment different from the other
socket corners
• a socket corner labeled “A1” or “Pin 1” on the motherboard or
socket
You must match the corner of the Pentium OverDrive processor which
contains the blunt edge and distinctive pin arrangement with this corner of the
socket.
Pentium OverDrive
processor corner
with blunt edge and
distinctive pin
arrangement
corresponds to this
socket corner
Socket With
Key Pin Hole
Socket With No
Key Pin Hole
Seating Your Pentium OverDrive Processor
In a socket with a handle:
If your socket has a handle, make sure the handle is completely open by
moving it up to a 90° angle. Place the Pentium OverDrive processor into the
socket, making sure to match the processor corner with the blunt edge and
distinctive pin arrangement to the socket corner containing the key pin hole.
Key pin
hole

16
If you removed a processor from the socket in a prior step, refer to the sketch
youmadeinStep4 for properorientationofthePentiumOverDriveprocessor.
No force is required for the pins to fit into the pin holes. Close the socket by
moving the handle down. Very little force is required to close the socket lever.
Do not use excessive force. Your computer’s system board should NOT bend
under the pressure.
PC-2643
Push handle to lock
In a socket with no handle:
Place the Pentium OverDrive processor into the socket, making sure to match
the corner with the blunt edge and distinctive pin arrangement to the socket
corner containing the key pin hole. If your socket does not have a key pin hole
corner, refer to the sketch you made in Step 4 to orient the Pentium OverDrive
processor correctly.
Seat the Pentium OverDrive processor in the socket by pressing firmly and
evenly on the key pin corner and the opposite corner at the same time. Be sure
to avoid pressing on the center of the fan and on the corners containing the
release clips and assembly connector.
DO NOT apply pressure to the center of the fan or corners
containing release clips and contact pins.
TM
Push here only
Push here only

17
Your computer’s system board should not bend under
theinsertionpressure. Ifitbendsmorethanslightly, or
if you have difficulity in correctly seating the Pentium
OverDrive processor, see your dealer for assistance or
refer to the section Getting Help, page 28.
Ensure that the motherboard in your system has sufficient support to allow
you to apply the pressure necessary to seat your Pentium OverDrive proces-
sor. It is important that you do not bend the motherboard during the seating
process. If necessary, you can place reinforcement such as a pad of paper
underneath the socket area. Be sure to remove the reinforcement before
turning your computer back on.
As you press firmly, you should be able to feel the Pentium OverDrive
processor slide into place. When the Pentium OverDrive processor is fully
inserted, the pins are barely visible, and there is a slight gap between the
Pentium OverDrive processor and the socket. The gap should be even around
each side of the Pentium OverDrive processor, and about the same thickness
as the chip removal tool.
If you have difficulty in seating the Pentium OverDrive processor, you may
find it necessary to remove the processor fan in order to apply pressure to the
center of the chip. For information on removing and replacing the fan, refer
to the section Troubleshooting, page 27.
Proceed to Step 6.

18
Step 7 - Start your computer and run the
computer's setup program.
Put the cover back on the system unit. Reconnect all the cables and cords, and
plug the power cord into the wall outlet.
Turn on your computer. If your computer requires it, run the computer’s setup
or configuration program. Refer to your computer owner’s manual.
If you have problems with your computer after installing the Pentium
OverDrive processor, turn to Troubleshooting.
Now you are ready to test the Pentium OverDrive processor.
Proceed to Step 8.
Step 6 - Set jumpers or switches, if required.
You may need to set switches, move or install jumpers or both on your
computer’s motherboard or removable card to let the computer know you’ve
added the Pentium OverDrive processor. See your computer owner’s manual
for more information. If your manual does not have a configuration section
for the Pentium OverDrive processor, contact your computer manufacturer's
technical support group.
Inmostcases,ifyouhavecorrectlyorientedthePentium
OverDrive processor, starting your computer does not
damage the processor or your computer even if jumper
or switch changes are required—the system simply
does not function correctly.
Once you have configured your computer, proceed to Step 7.

19
You can test your installation by either running a software program you use
frequently and experiencing the increased performance, or by using the
diagnostics on the diskette included in your Pentium OverDrive processor
package. If you installed the diskette software to view the animated demo
prior to this step, you do not need to reinstall the software at this time. To use
the diagnostics:
For DOS users Go to the odp_util directory and type:
overdriv e
For Windows NT users Go to the odp_util directory and
type from a full-screen DOS
prompt:
overdriv e
For Windows users: Double click the icon “OverDrive
Processor Demo/Diagnostics”
For OS/2, OS/2 WARP users: Ensure that the following line ap-
For more information, pears in your config.sys file:
refer to Troubleshooting VME=NO
section, p. 26. Ensure that the settings for your DOS
full-screen command prompt in-
cludes the following:
HW_TIMER set to ON
From a full-screen DOS prompt type:
overdriv e
For Windows 95 users: Press e or click OK
When the Main Menu appears, select “Intel OverDriveProcessor Diagnos-
tics.” If the diagnostic utilities program tells you the Pentium OverDrive
processor is not operating correctly or if you do not obtain any performance
increase, see the Troubleshooting section to determine possible problems. If
you cannot troubleshoot the problem, contact your dealer for assistance. If
you require further assistance, see the Getting Help section.
Step 8 -Test the Pentium OverDrive processor
installation.
Your Intel Pentium OverDrive processor installation is com-
plete.

20
Removing the Software Files From Your Hard Disk
Once you have installed and tested the Pentium OverDrive processor, you can
delete the demonstration and post-install diagnostic software from your hard
disk. To remove the software, follow these instructions:
For DOS users: Go to the ODP_UTIL directory and
type:
uninstal e
For Windows users: In the Program Manager, select:
FILE
and then select:
RUN
On the Command Line type:
c:\odp_util\uninstal
and click OK
This removal program does not delete the Fan Monitor
software. Intel strongly recommends you keep the Fan
Monitor software resident on your system.
Demonstration and Diagnostics Diskette
Intel includes a Demonstration and Diagnostics diskette with your Pentium
OverDrive processor. The diskette contains two portions:
• a demonstration to guide you through the Pentium OverDrive
processor installation procedure. In order for you to view the
installation demonstration, your computer must be equipped
with a VGA video board and monitor.
• diagnostics to test your Pentium OverDrive processor for
proper installation and operation. For an overview of the
diagnostics, refer to the Troubleshooting section, page 20.
For information on how to install the diskette software, refer to page 6.
The installation program also asks you if you wish to
only install the Fan Monitor portion of the diagnostic
software. If you want to install the fan test software to
your hard drive but do not desire the demonstration or
post-install diagnostics, choose this option.

21
Troubleshooting
This section contains the following information:
• describes and explains the diagnostic utilities included on the
diskette in your installation package
• contains a checklist to help you find solutions to problems you
may encounter while installing your Pentium OverDrive pro-
cessor
• provides a process for removing the Pentium OverDrive
processor fan
Diagnostics Overview
The diagnostic software on the diskette allows you to test the Pentium
OverDrive processor for proper operation at the time of installation. In
addition, fan monitor software provides ongoing assurance that your Pentium
OverDrive processor fan is functioning normally.
Testing the Installation
This list describes the diagnostics that you use to test your installation:
Processor Instruction Tests various processor functions
to see if they are working properly.
Floating Point Conformance Tests processor’s floating point unit
by comparing the value of floating
pointcalculationswithanestablished
standard.
Processor Information Compares processor speed and fea-
tures “before” and “after” Pentium
OverDrive processor installation.
Fan Status Checks to see that the fan on your
Pentium OverDrive processor is op-
erating properly.