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    Installing an Intel Math CoProcessor

    Contents:

    • INSTALLING AN INTEL MATH COPROCESSOR -- GENERAL PROCEDURE
    • NOTE ON INSTALLING AN INTEL387 MATH COPROCESSOR IN A WEITEK SOCKET
    
    

    INSTALLING AN INTEL MATH COPROCESSOR -- GENERAL PROCEDURE

    
       On most desktop computers, your math coprocessor is easy to install and
    
       use.  Many system manufacturers include information for installing math
    
       coprocessor  upgrades in their user*s guides. If you are unable to
    
       obtain upgrade installation  instructions from your system manufacturer,
    
       complete the following steps. For  more information, refer to the User's
    
       Guide that came with your Intel Math CoProcessor.
    
    
    
       1. Ground yourself
    
       To prevent static discharge from damaging your system or your math 
    
       coprocessor, ground yourself by touching the metal back or side panel on
    
       your  computer.
    
    
    
       2. Switch the power off and unplug your computer
    
       Unplug the power cord and remove the cover from the computer as 
    
       described in your owner*s manual.
    
    
    
       3. Check your math coprocessor
    
       Be sure your math coprocessor is rated at a speed equal to or greater 
    
       than the speed of your computer's microprocessor. In addition, inspect
    
       the math  coprocessor for any damaged or bent loops or pins. Do not try
    
       to repair  damaged pins, but return the math coprocessor to your dealer.
    
    
    
       4.  Find the socket
    
       Find the empty socket for your Intel Math CoProcessor by locating the 
    
       Intel microprocessor and looking for an empty socket nearby. Refer to
    
       your  system's documentation or contact with your dealer or system
    
       manufacturer for  further information.
    
    
    
       Intel287 XL         The square shaped Intel286 CPU and an empty
    
                           rectangular socket nearby. With the exception of the
    
                           Intel287 XLT sockets, all Intel287 math coprocessor
    
                           sockets have 20 pin holes on each side and a small
    
                           notch at one end.
    
    
    
       Intel2The square shaped Intel286 CPU and an empty 1 inch square
    
                           bowl-shaped socket nearby. Electrical contacts line
    
                           the socket's inside perimeter.
    
    
    
       Intel387 SL or SX   The Intel386 SL or SX microprocessor and look for an
    
                           empty, square socket on the motherboard near the
    
                           microprocessor
    
    
    
       Intel386DX          The Intel386 DX processor and look for an empty
    
                           socket nearby that is similar in size and shape to
    
                           the processor.
    
    
    
       5. Orient the math coprocessor correctly
    
       Match pin 1 on the math coprocessor with pin 1 on the socket. The pin 1
    
       corner on an Intel387 SX, Intel387 DX and the Intel487 SX is marked with
    
       a  small beveled edge and a white dot. The Intel 8087 and the 80287XL
    
       has a small  bevel cut in one end of the processor.
    
    
    
       Pin 1 is marked on the socket with a notch, bevel, dot, arrow, or other 
    
    
    
       mark which could be on the system board. If you're unsure where pin 1 is
    
       on  your socket, refer to your computer manual or ask your dealer for
    
       help.
    
    
    
       6. Insert the math coprocessor 
    
       After aligning pin 1 correctly, lightly place the math coprocessor chip
    
       into  its socket. Press firmly and evenly on the math coprocessor to
    
       either seat the  loops of the Intel387 SX in the socket, or to seat the
    
       pins of the 8087, Intel287 XL,  Intel387 DX or Intel487 SX in the
    
       socket. Math coprocessors that have pins may require considerable force
    
       to seat the math coprocessor.
    
    
    
       Warning: Your computer*s system board should not bend under the
    
       insertion  pressure. If it bends more than slightly, see your dealer for
    
       assistance.
    
    
    
       7.  Set switches on the system board
    
       You may need to set switches, jumpers or both on your computer's system 
    
       board to let the computer know you have added a math coprocessor. See
    
       your computer owners manual, or contact the system's manufacturer for
    
       more  information. If you cannot obtain configuration information from
    
       your manufacturer, call Intel's online services and request the document
    
       containing configuration information for your system. This information
    
       is also available through Intel's online services and.
    
    
    
       In most cases, if you have correctly oriented the math coprocessor, 
    
       starting your computer does not damage the processor even if jumper or
    
       switch  changes are required--the system simply does not function
    
       correctly.
    
    
    
       8. Restart your computer
    
       Put the cover back on the computer. Reconnect all the cables and cords, 
    
       and plug the power cord into the wall outlet. Turn your computer on.  
    
    
    
       9. Run reference or system configuraton program
    
       Some computers have a System Installation, Reference, or System 
    
       Configuration program that must be run to enable the system to utilize a
    
       math  coprocessor. The program may be in ROM or on a disk. See your
    
       owner's  manual for more information.
    
    
    
       10. Test the Intel math coprocessor in your computer
    
       Use the software program on the utilities diskette that came with your 
    
       math coprocessor to test the math coprocessor. Run the diagnostics
    
       program to  verify the math coprocessor is operating correctly. If the
    
       program shows the  math coprocessor isn't operating correctly, contact
    
       your dealer for assistance.
    
    
    
    

    NOTE ON INSTALLING AN INTEL387 MATH COPROCESSOR IN A WEITEK SOCKET

    
       Many computers contain a square socket for a Weitek math coprocessor.
    
       This  socket has three rows of holes on all four sides. In many
    
       computers, such as the  Compaq 386, the inner two rows of pins are
    
       compatible with the Intel387 DX  Math CoProcessor.
    
    
    
       To install, enter the Intel387 DX Math CoProcessoron the inner two rows
    
       and  match pin 1 on the math coprocessor with the key pin hole on the
    
    
    
       socket and  then press down. Be sure that all the pins are aligned over
    
       the socket holes before you push down. If you still have questions,
    
       consult your computer user's  manual.
    
    
    
       Some computers, such as the TANDY 4000, have the Weitek socket but DO 
    
       NOT support the Intel387DX.  Contact your computer manufacturer or
    
       dealer for  more specific information to ensure you should use the
    
       Weitek socket for your  math coprocessor.
    
    
    
       For more information, refer to the following documents:
    
    
    
       Document #   Title
    
    
    
       3065         MCP Installation Troubleshooting: Failure to Boot
    
    
    
       3066         MCP Installation Troubleshooting: Lockups and Hangs
    
    
    
       3067         MCP Installation Troubleshooting: Error Messages
    
    
    
       3068         MCP Installation Troubleshooting: Using Diagnostics
    
    
    
       3069         MCP Installation Troubleshooting: Diagnostic Failures
    
    
    
       3071         MCP Installation Troubleshooting: Processor Not Functional
    
    
    
       3072         MCP Installation Troubleshooting: Software Does Not
    
                           Function 
    
    

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