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QUIET.DOC
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1993-08-27
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QUIET
Free DOS utility: quiets noisy programs
Version 1.00 - August 27, 1993
(c) 1993
by
David Daniel Anderson
Reign Ware
QUIET quiets noisy programs, by replacing certain noisemaking program
codes.
WARNING!!! QUIET OVERWRITES THE INPUT FILE, SO MAKE SURE THAT YOU
EITHER WORK ON A -COPY- OF YOUR FILE(S) OR YOU KNOW WHAT YOU ARE
DOING BEFORE YOU START.
Usage: QUIET noisy_prog
Examples:
QUIET hangman.com
QUIET *.exe
QUIET pac*.*
QUIET d:\games\fire.com
QUIET needs one and only one parameter on the command line: the file
to be silenced. By using wildcards (* and ?), multiple files can be
processed in one pass. (See the DOS manual for wildcard info.)
QUIET will maintain the original date and time of the file(s).
How it works:
QUIET simply replaces the two-byte sequence: µa with: ÉÉ
In hex, that is: E6 61 and: 90 90.
In decimal it is: 230 97 and: 144 144.
The E6 61 code is simply an instruction to activate the speaker, and
the 90 90 code is simply an instruction to do nothing.
Possible complications/ reasons for failure:
1) Some programs check themselves, and will not work at all if they
have been changed.
2) Many programs make noise by other methods, and will not be silenced.
3) If the file was read-only, it cannot be processed.
4) Some virus detectors will complain if you try this on a file which
you have told the watch dog program to monitor.
Note: other errors are mentioned by the program when it encounters them.