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PROBLEMS.TXT
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1992-07-07
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During the development of PKZIP v. 2.0 for MS-DOS, PKWARE has
discovered hardware faults in newer 80386 & 80486 computers.
These faults can cause anomalies in the operation of PKWARE
software as well as other software.
PKWARE has been endeavoring to locate an anomaly that has been
observed by a number of customers and associated vendors. The
intial symptoms of the problem were:
- Particular files extracting with errors on one machine, but not
on another.
- Installs of some products failing.
These problems have been observed primarily on newer, fast (33Mhz
or faster) 80386 and 80486 machines. Investigation of the problem
revealed no difference in software or hardware between machines
that failed and machines which did not. The files which fail do
not fail every time.
To further test where the problem was occuring, a very simple
program which would load a test file into a RAM buffer and then
copy it to a second RAM buffer was created. The program then
compares the two buffers one byte at a time and reports any
discrepancies. Discrepancies with even the simple copy were
noted.
If the EXTERNAL CACHE is turned off through the BIOS
configuration, the problem does not occur.
This is indeed a hardware flaw.
While this effort to work around these hardware faults will,
unfortunately, delay the release of PKZIP v. 2.0 for MS-DOS, we
hope to release it in the next few months.
We know you will be pleased with the many new features and
enhancements to PKZIP. We appreciate your understanding and
patience in our efforts to provide reliable software.
Sincerely,
PKWARE, Inc.