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Q98345: DoubleSpace and R6002 Run-Time Errors

Article: Q98345
Product(s): Microsoft Disk Operating System
Version(s): MS-DOS:6.0
Operating System(s): 
Keyword(s): kbenv kbtool
Last Modified: 23-DEC-1999

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The information in this article applies to:

- Microsoft MS-DOS operating system version 6.0 
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SUMMARY
=======

The MS-DOS 6.0 DoubleSpace disk-compression utility executes some floating point
(non-integer math) calculations and therefore may attempt to use a math
coprocessor (80x87 or equivalent) if one is present. If a machine's numeric
processing system is substandard or compromised due to the presence of device
drivers, TSRs, or faulty hardware, DoubleSpace may either report inaccurate time
estimates for completion or fail and generate the following errors:

- Run-time error R6002 - floating-point support not loaded

- Run-time error R6002 - floating-point error

- Error: R6101 - Floating Point Divide by Zero

MS-DOS 6.2 DoubleSpace does some floating point arithmetic, but it does not
attempt to use a math coprocessor even if one is present. This issue can occur
in other programs that do not use the math coprocessor.

NOTE: In some cases, no runtime error(s) are displayed, and DoubleSpace stops
responding (hangs) early in the compression process.

MORE INFORMATION
================

IMPORTANT: Since DoubleSpace has detected a potential problem with your system,
perform a full system backup or make sure you can fully restore the machine from
removable media before you proceed with these steps.

Use the following steps to troubleshoot DoubleSpace R6002 errors:

1. Turn the machine off, then turn it on again. Press the F5 key when the
  "Starting MS-DOS" message appears to perform a "clean start." If your machine
  requires that a device driver is loaded in the CONFIG.SYS file to boot
  properly, press the F8 key to perform an "interactive start" and load ONLY
  the device driver(s) required. If the machine is rebooted at any point in the
  DoubleSpace process, be sure to use the EXACT same clean or interactive start
  each time. If DoubleSpace completes successfully, one or more of the device
  drivers or terminate-and-stay-resident (TSR) programs that were bypassed are
  probably causing the problem.

2. If DoubleSpace still fails with the R6002 error, try adding the following
  line to the CONFIG.SYS file using MS-DOS Editor or another ASCII text editor:
  set no87=nomath Restart your computer to make this change take effect. The
  SET NO87 environment variable instructs DBLSPACE.EXE not to use the math
  coprocessor for floating-point calculations. The SET statement should be
  placed in the CONFIG.SYS file, not the AUTOEXEC.BAT file. (If DBLSPACE.EXE is
  restarted, it may not process the AUTOEXEC.BAT file completely.) It doesn't
  matter what you set NO87 to as long as the NO87 variable is in the MS-DOS
  environment. For example, you could set NO87=NO or NO87=MICROSOFT, and
  DoubleSpace would not use the math coprocessor. To remove the NO87
  environment variable, type "set no87=" (without the quotation marks) at the
  MS-DOS command prompt and then press ENTER.

3. If DoubleSpace continues to fail, the coprocessor itself, the coprocessor
  subsystem, or some other hardware component may be causing the problem.


  In the case of 286, 386, and 486 SX machines, try removing the
  coprocessor for testing purposes. If the machine is a 486 DX, verify
  that the system's ROM BIOS is current and specifically designed for
  use with a 486 DX, not a 386 or 486 SX.

  In rare cases, incorrect CMOS or system board DIP switch settings,
  faulty system RAM, or other hardware problems may cause R6002 errors.
  Contact your system vendor or manufacturer to verify the CMOS and DIP
  settings are correct. If the error persists, remove all system
  components not absolutely required to operate the machine (optional
  I/O adapters and so forth), use replacement parts (in the case of
  system RAM), or have the machine inspected by a hardware repair
  technician.


Additional query words: 6.00 FPU NDP dblspace double space runtime stop hang clean start

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Keywords          : kbenv kbtool 
Technology        : kbMSDOSSearch kbMSDOS600
Version           : MS-DOS:6.0

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