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    MCP INSTALLATION TROUBLESHOOTING: PROCESSOR NOT FUNCTIONAL

    Contents:

    • TROUBLESHOOTING THE FAILURE TO FUNCTION AFTER INSTALLING AN INTEL MATH COPROCESSOR
    • SET 87=NO (OR OFF) DISABLES MATH COPROCESSOR
    • NOTE ON INSTALLING AN INTEL387(TM) DX MATH COPROCESSOR IN A WEITEK SOCKET
    
    

    TROUBLESHOOTING THE FAILURE TO FUNCTION AFTER INSTALLING AN INTEL MATH COPROCESSOR

    
        FaxBack # 3071.00
    
    
    
       The following solutions may help if you install an Intel Math
    
       CoProcessor, boot  up the system and your math coprocessor fails to
    
       function: 
    
    
    
    

    SET 87=NO (OR OFF) DISABLES MATH COPROCESSOR

    
       FaxBack # 3071.01
    
    
    
       If you install your Math CoProcessor and your system is functioning
    
       correctly,  but the processor does not appear to be working, check to
    
       ensure that the  environment variable 87 is not set equal to the value
    
       of NO.
    
       
    
       Although this condition does not directly disable the math coprocessor,
    
       if a  program checks the variable 87 and finds it set to NO (or OFF),
    
       the program  uses floating-point emulation subroutines instead of the
    
       math coprocessor.   
    
       
    
       Not all programs check for this variable so its usefulness is limited.
    
       Ask your  software manufacturer for information on how this command
    
       affects their  program.  
    
       
    
       To enable the math coprocessor, type the following DOS command:
    
       
    
            SET 87=YES or  ON 
    
       
    
    
    
    

    NOTE ON INSTALLING AN INTEL387(TM) DX MATH COPROCESSOR IN A WEITEK SOCKET

    
       FaxBack # 3071.02
    
    
    
       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 Intel387 DX.  Contact your computer manufacturer or
    
       dealer for  more specific information to ensure you should use the
    
       Weitek socket for your  math coprocessor.
    
       
    
       FaxBack Document #3071 Created 9/94 
    
    

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