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- ║ INTEL MATH COPROCESSOR SOFTWARE TROUBLESHOOTING ║
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- LOTUS 1-2-3 AND SYMPHONY @NA FUNCTION
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- The @NA function in 1-2-3 version 2.01 and early versions of
- Symphony will not work correctly on a system with a 387DX
- installed. The problem has been corrected in 1-2-3 version 2.2.
- The phone number for Lotus Development is (617) 253-9150.
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- GENERAL SOFTWARE USE OF MATH COPROCESSORS
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- Not all programs make good use of MCPs. Scientific and
- CAD/Graphics programs use MCPs intensively for screen graphics and
- floating point calculations. Spreadsheets use coprocessors for
- exponents, internal rate of return, net present value, and certain
- arithmetic calculations. Basic math functions (add, subtract,
- multiply, and divide) are sped up minimally or not at all,
- depending on the program.
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- -E+999 WHEN ENTERING NUMBERS
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- You'll see this error if the math coprocessor switch on the system
- board is set incorrectly.
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- 386 XENIX/UNIX AND THE 387DX
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- When 386(TM) versions of Xenix or Unix run on a computer
- containing an Intel 387(TM) DX math coprocessor, the computer can
- lockup intermittently. Read FaxBack document #3054 for more
- detailed information on this problem.
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- CADKEY
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- CadKey released a 32-bit version of their 3D CAD software. This
- triggers the errata 21 problem when the customer asks the program
- to redraw images with arcs or text.
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- CadKey has an article that talks about the Errata 21 problem as
- though it's a problem in the MCP instead of in the processor. So
- their tech support is telling customers to get their MCP replaced.
- Instead, the customer needs to call the manufacturer of the
- computer to deal with the 386 processor.
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- CadKey tech support
- Voice ph: 203-647-0220
- FAX: 203-649-8231
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- February 25, 1991 Intel FaxBack # 3060 Page 1
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- ║ ║
- ║ INTEL MATH COPROCESSOR SOFTWARE TROUBLESHOOTING ║
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- ╚══════════════════════════════ (continued) ══════════════════════════════╝
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- LOCKUPS WITH CERTAIN CAD PROGRAMS
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- An incorrect computer configuration can cause certain programs to
- lockup while others work fine. You must make sure that the
- computer's SETUP and/or switch settings correctly indicate the
- presence of a Math Coprocessor.
-
- (Field report) A report indicated that in a computer with the
- Intel Inboard 386/AT and 387DX Math Coprocessor, if Math
- Coprocessor switch was set wrong, Autocad ran just fine but
- Digicad didn't.
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- LOTUS 1-2-3 MATH COPROCESSOR TEST
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- Here's a quick and easy method for testing your math coprocessor
- using Lotus 1-2-3:
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- 1. Enter this formula in cell A1: @exp(@rand)
- 2. Copy the formula to a large range with this command:
- /C<cr>A1..Z400<cr>
- 3. Press F9 and time how long it takes the spreadsheet to
- recalculate.
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- In an 8 MHz computer, it should take about 1 minute without a math
- coprocessor and about 10 seconds with a math coprocessor. In a
- 4.77 MHz computer, it should take about 3 minutes to recalculate
- without a math coprocessor and about 27 seconds with a
- coprocessor. The difference in time is noticeable even without a
- stopwatch.
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- 1-2-3: GARBAGE IN CELLS
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- A defective math coprocessor can cause unpredictable values in
- number cells. Test your math coprocessor with Intel's CHKCOP
- program. Download the program with your modem from (503) 645-6275
- or contact Intel Customer Support
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- ═══════════════════════════════════════════════════════════════════════════
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- February 25, 1991 Intel FaxBack # 3060 Page 2
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- ╔═════════════════════════════════════════════════════════════════════════╗
- ║ ║
- ║ INTEL MATH COPROCESSOR SOFTWARE TROUBLESHOOTING ║
- ║ ║
- ╚══════════════════════════════ (continued) ══════════════════════════════╝
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- SET 87 = NO (OR OFF)
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- Some programs will respond to the command SET 87=NO. This DOS
- command creates an environment variable. It does not directly
- disable the math coprocessor. If a program checks the variable
- "87" and find it set to "NO" (or "OFF"), the program will use
- floating-point emulation subroutines instead of the math
- coprocessor. Not all programs will check for this variable so its
- usefulness is limited. Ask your software manufacturer for
- information on how their program responds (or doesn't respond) to
- this command.
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- ═══════════════════════════════════════════════════════════════════════════
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- February 25, 1991 Intel FaxBack # 3060 Page 3
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