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MCP INSTALLATION TROUBLESHOOTING: PROCESSOR NOT FUNCTIONAL
Contents:
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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