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Shareware Extravaganza - Disc 4
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Shareware Extravaganza - Over 25,000 Programs (The Ultimate Shareware Company)(Disc 4 of 4)(1993).iso
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techinfo.zip
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3062.TXT
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1991-03-03
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╔═════════════════════════════════════════════════════════════════════════╗
║ ║
║ INTEL MATH COPROCESSOR HARDWARE TROUBLESHOOTING ║
║ ║
╚═════════════════════════════════════════════════════════════════════════╝
386 XENIX/UNIX AND THE 387DX
────────────────────────────
When 386(TM) versions of Xenix or Unix run on a computer containing an
Intel 387DX math coprocessor, the computer can lockup intermittently.
Read FaxBack document #3054 for more detailed information on this
problem.
387DX & WEITEK SOCKETS
──────────────────────
Many computers contain with 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 Intel 387DX. This gives you the option of
using an 387DX or the Weitek math coprocessor.
However, if you want to install an 387DX in the Weitek socket, you must
use EXTREME CAUTION to orient the chip correctly; otherwise you could
damage the computer and the 387DX. Read your computer's User Guide to
determine the correct procedure for installing the 387DX in your
computer. The Installation Guide for the 387DX contains general
information which may be useful also. If you have trouble figuring out
how to correctly install the chip, have your dealer perform the
installation for you. Intel can't replace a part which has been
destroyed by incorrect installation.
Some computers use the Weitek socket but DO NOT support the 387DX, such
as the TANDY 4000. Contact your computer manufacturer or dealer for
more specific information.
387DX/MATH UNIT AND IBM ADVANCED DIAGNOSTICS
────────────────────────────────────────────
The 387DX and Inboard 80287 Math Module will fail the IBM Advanced
Diagnostics. This happens because the diagnostics reinitialize the
387DX or Math Module after the Inboard 386 has already initialized it.
Use the CHKCOP program on the Inboard 386 diskette to test an 387DX or
Inboard math module.
═══════════════════════════════════════════════════════════════════════════
2/90 Intel FaxBack # 3062 Page 1
╔═════════════════════════════════════════════════════════════════════════╗
║ ║
║ INTEL MATH COPROCESSOR HARDWARE TROUBLESHOOTING ║
║ ║
╚════════════════════════════════(continued)══════════════════════════════╝
BURNED PIN ON 387DX
───────────────────
The most common cause for burned pins on the 387DX is incorrect
installation. In many computers, the 387DX is oriented differently
from the other large chips. Carefully follow the manufacturer's
installation instructions to avoid damaging the 387DX. The Intel
warranty doesn't cover chips which were installed incorrectly.
COMPAQ COMPUTER PROBLEMS
────────────────────────
If, after adding an Intel product (such as INBOARD, ABOVE BOARD or Math
Coprocessor), your COMPAQ 286 computer begins to reboot itself
automatically, it is usually a symptom of one of two problems:
■ The connection between the power supply and the system board could
be defective. The computer will continue to operate until either an
additional burden is placed on the power supply, or enough oxide
builds up to cause the failure. The cure for this is to vigorously
reseat the connection. Be careful to not apply excessive force and
break the connector or system board.
■ The power supply could be taxed beyond it's capabilities. The only
solution for this problem is to replace the power supply with a
bigger one.
REMOVING 80287 FROM IBM PC AT
─────────────────────────────
After removing a math coprocessor from an IBM PC AT computer, you must
rerun your computer's SETUP program. If you still receive an error
message because the computer can't find the chip, you may have to
temporarily unplug the battery from the system board. All SETUP
information will be lost, so be sure to write down the hard drive type,
floppy drive type, memory and video configurations before unplugging the
battery. This information is critical in correctly reconfiguring your
computer.
═══════════════════════════════════════════════════════════════════════════
2/90 Intel FaxBack # 3062 Page 2
╔═════════════════════════════════════════════════════════════════════════╗
║ ║
║ INTEL MATH COPROCESSOR HARDWARE TROUBLESHOOTING ║
║ ║
╚════════════════════════════════(continued)══════════════════════════════╝
REPLACEMENT 8088
────────────────
If you have an 8087 and a 4.77-MHz 8088 dated '78, you can get a free
replacement 8088. Contact Intel Customer Support for the replacement.
NOTE: Only 4.77-MHz 8088 chips need to upgraded. The 8088-2 and 8088-
1 do not require replacement.
IBM PS/2 MODEL 80, 387DX & NOISE FROM SPEAKER
─────────────────────────────────────────────
Some of the 8580 Models 111 and 311 with math coprocessors installed
may experience trouble with the speaker. You may hear crackling or
beeping noises while the computer is running. the 387DX doesn't cause
this problem. The following computers may have the problem:
■ 8580 Model 111, with serial numbers below 6019000
■ 8850 Model 311, with serial numbers below 6502022
═══════════════════════════════════════════════════════════════════════════
2/90 Intel FaxBack # 3062 Page 3