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* PatchCRT - fix RunTime Errors on some apps*

A freeware utility, which patches some older MS-DOS EXE files, to permit
them to run on fast Pentium CPUs.

This speed problem applies only on CPUs which match or exceed the speed
of a Pentium 200 (approx), and applies only to some older versions of a
specific software module named CRT.ASM, which was part of the
Turbo-Pascal offerings from Borland.

Be aware that this CRT.ASM module has been used in a variety of other
products, and it is often not initially obvious that some flawed CRT.ASM
code is embedded in other apps.

The symptom is a /Divide-by-Zero/ error message when the app is run on a
fast CPU, or a /Divide Overflow/ error message, or a /Runtime Error 200/
message, or similar. Unfortunately, the error message usually won't
simply say that the CPU is /too fast/ !.

The preferred solution is to use an updated version of CRT.ASM, or to
contact the software developer, and request that an updated CRT.ASM be
used to re-build the app/utility.

However, if this is not possible, then PatchCRT can be tried. Similar
CRT.ASM "patchers" are available from others - though feedback suggests
that a few different versions of flawed CRT.ASM code were released, and
that this patcher copes with all known releases. Note: we've seen a few
EXE files with the 200 error, but which PatchCRT, up to ver 1.5, would
not adjust. On looking inside these EXEs, we noticed some code which is
similar to published versions of CRT.ASM, but not EXACTLY the same. As
of Jan 2000, we released ver 1.6, which also recognises this /similar/
code, and patches it accordingly. Which is another way of saying - TEST
your app carefully, if PatchCRT patches it !!.

This program is /freeware/: use it at your own risk; take good backups
first; test carefully - the usual small print.

We'd appreciate feedback <feedback.htm>, if it works for you, and
feedback <feedback.htm> if it does not !.

Download PatchCRT.ZIP. <download/patchcrt.zip> This file-size is about
30k. (See Download Instructions <index.html>).

Note-1: Sometimes, EXE files are Compressed. PatchCRT does not include
any de-compression code, and therefore will not repair compressed EXE
files. If PatchCRT does not work for you, you might check if the EXE
file is compressed, eg using PKLITE, LZEXE, etc. (To do so, you'll
probably need to analyse the internal structure of the EXE file, which
is WAY outside the scope of this brief note!!). If it's compressed,
identify the compressor that was used, run the appropriate de-compressor
and retry PatchCRT on the de-compressed file. If it works, you can
probably re-compress the updated file, or just use the de-compressed
version.

Note-2: We think there is some other software product out there with the
same name (PatchCRT). We apologise if this is a source of confusion. We
could change the name of this utility, if needed, though it has been on
Compuserve (and on this website!) for some years, and it's probably now
"late-in-the-day" to change it. Also, the need for this utility is quite
small, and a duplicate name is probably of little concern.
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