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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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3010.TXT
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1991-03-03
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199 lines
╔═════════════════════════════════════════════════════════════════════════╗
║ ║
║ INTEL MATH COPROCESSOR TECHNICAL INFORMATION ║
║ ║
╚═════════════════════════════════════════════════════════════════════════╝
387(TM) DX AND 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.
SPEED TESTS
───────────
The following table lists the results of tests Intel performed in an
IBM PC AT. The first two columns compare computation times for the
standard IBM PC AT with and without an Intel Math Coprocessor. The
third and fourth columns depict the same IBM AT upgraded with the Intel
Inboard 386. The third column lists results obtained using the 80287
Math Module with the 386DX while the fourth column shows the
386DX/387DX combination.
═══════════════════════════════════════════════════════════════════════════
2/90 Intel FaxBack # 3010 Page 1
╔═════════════════════════════════════════════════════════════════════════╗
║ ║
║ INTEL MATH COPROCESSOR TECHNICAL INFORMATION ║
║ ║
╚════════════════════════════════(continued)══════════════════════════════╝
┌───────────────────────────────────────────────────────────┐
│ SYSTEMS: IBM PC AT IBM PC AT Inboard 386 Inboard 386│
│ without with with with │
│ Coprocessor Coprocessor Math Module 387DX │
╞═══════════════════════════════════════════════════════════╡
│ WHETSTONES ----- 102K 183K 319K │
├───────────────────────────────────────────────────────────┤
│ LOTUS 123 (time in seconds): │
│ Budget 8.3 8.3 3.7 3.7 │
│ Finance 13.5 5.7 2.7 2.2 │
│ Engineering 29.2 3.9 1.9 1.5 │
├───────────────────────────────────────────────────────────┤
│ AUTOCAD: │
│ Regen 53.0 12.0 9.4 8.1 │
│ Remove │
│ Hidden 16:14 8:01 6:58 6:19 │
│ Lines │
└───────────────────────────────────────────────────────────┘
GENERAL SOFTWARE USE OF MATH COPROCESSORS
─────────────────────────────────────────
Not all programs make good use of Math Coprocessors. Scientific and
CAD/Graphics programs use math coprocessors extensively for screen
graphics and floating point calculations. Spreadsheets use coprocessors
for exponents, internal rate of return, net present value, and certain
arithmetic calculations. A math coprocessor won't speed up addition and
subtraction and will speed up multiplication and division only
slightly.
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.
═══════════════════════════════════════════════════════════════════════════
2/90 Intel FaxBack # 3010 Page 2
╔═════════════════════════════════════════════════════════════════════════╗
║ ║
║ INTEL MATH COPROCESSOR TECHNICAL INFORMATION ║
║ ║
╚════════════════════════════════(continued)══════════════════════════════╝
MATH COPROCESSOR POWER CONSUMPTION
──────────────────────────────────
The Intel Math CoProcessors consume the following amounts of power.
┌──────────┬───────────┐
│ Chip │ Power │
╞══════════╪═══════════╡
│ 8087 │ 3 watts │
│ 80287 │ 3 watts │
│ 80C287A │ 1.5 watts │
│ 387DX │ 1.5 watts │
└──────────┴───────────┘
These are worst case figures; typical power consumption is somewhat
less.
═══════════════════════════════════════════════════════════════════════════
2/90 Intel FaxBack # 3010 Page 3