Time Error 200 (Divide by Zero) is usually caused by
a bug in older versions of Turbo Pascal and Borland
Pascal compilers (version 6 and earlier). The bug was
specifically in the CRT.ASM unit included with these
DOS based programs that were compiled using these buggy
versions of the CRT unit will generate the RTE200 error
when started on a CPU that is faster then 200 Mhz (though
some non-Intel CPU's would avoid the error up to 350
solution is to recompile the source code using a later
version of Pascal, or a fixed CRT.ASM unit. Obviously
that's only possible if you have the source code available.
more common solution is to patch the .EXE file to disable
the bug. There are several programs that allow this.
The one I recommend is PatchCRT
by Kennedy Software. This one is more compatible then
most others, including TPPatch
(which is less effecent, and uses German results and
suggest keeping PatchCRT.exe in your path, so that you
can run it from any directory simply by typing it followed
by the name of the .EXE to be patched.
PatchCRT will only be able to patch .EXE files which
have not been compressed by an EXE compressor, such
as aPACK, Diet, LZEXE, PKLite, Petite, UPX, etc. If
PatchCRT fails to patch the .EXE, there is a good chance
it is because the .EXE has been compressed.
best tool I have found to uncompress .EXE files is UNP.
This has worked for about 80% of the compressed .EXE
files I have encountered. The nice thing about UNP is
it runs well under Windows. My second choice would be
but this works best in a plain DOS environment without
any extended memory manager (including himem.sys or
emm386.sys) installed. I have used this tool to uncompress
several .EXE's which UNP was unable to do.
you have sucessfully uncompressed a compressed .EXE
file, you should then be able to run PatchCRT on it
to remove the RTE200 bug.
all the above fails, the other option is to run a TSR
(Terminate and Stay Resident) utility that will provide
a kluge to the division by zero issue by catching this
error as the .EXE is being run, and telling DOS to ignore
it. The best TSR I have found to do this is TP7p5fix.
run the TP7P5.EXE to load the TSR into memory, and any
programs being run in that DOS window will avoid the
RTE200. Keep in mind that once you close this DOS Window,
or open other DOS Windows the TSR will not be active
unless you load it again.
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