Red screen of death on old DOS accounting software (corrupted background structure)

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I need help tracing down the source of this error I'm getting. I'm guessing somebody who was doing C++ in the DOS era could have seen it already. Maybe it is not an OS error but an application error colored red.

I would be grateful if somebody could answer the following:

  • what exactly is a corrupted background structure error
  • where could I find a manual for fm_rd , fm_ed .. and other listed stack functions (are those functions at all ?) ? I'm hoping that knowing what they are will help me locate the exact moment the error triggers.

All the info I have that could possibly help:

  • it's an old single core Pentium (error popped on AMD machine also and others) with an ATA disk.
  • I presume it's coded in C++
  • uses Paradox DB
  • occurs at the moment I try to print out some accounting data and save changes to disk(DB).(it's actually 2 operations in one so I'm not sure which one errors out)
  • nothing prints , nothing saves to DB
  • FAT filesystem

I'll update in the morning if I find anything in the machine's logs.

Thank you all very much in advance!!

This is the screenshot: http://cityinfo.hr/fotka.jpg

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