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SILENCE.DOC
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1985-12-31
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SILENCE
Version 1.0
Copywrite (c) 1985 by Carl Burtner
Program Description:
SILENCE is a resident addition to DOS that reduces or eliminates most
program sounds. Beeps are shortened and melodies are reduced to
one short beep followed by a series of clicks. Some sound effects using
very short duration tones may still sound. The program functions by
intercepting the system clock tick interrupt. Once installed (by entering
the command SILENCE), at every tick (18.2 times a second) the speaker is
turned off and timer 2 is set to produce a single click. The program can
be turned ON (no sound) or OFF (sounds allowed) through the commands
SILENCE ON and SILENCE OFF. Communication with the installed program
(to turn it ON and OFF) is accomplished through use of the unformatted
data area of the program segment prefix of the installed program. This
communication can be disrupted by other programs which intercept the
system clock tick (such as a printer spooler). If communication is not
possible the user is notified. SILENCE should be compatible with most
programs. If interference is caused by another resident program, try
switching the order in which the programs are installed.
Commands:
SILENCE - Entering SILENCE without parameters installs the resident
portion of the program and silences the speaker. As Silence
is a resident addition to DOS, available memory will be
decreased by the size of the program (300 bytes). SILENCE
checks during installation to see if the resident portion has
already been installed. If it has, or if another resident
program exists which may interfere with the operation of
SILENCE, the user is given the option to abort or continue
with the installation.
Installing more than one copy of SILENCE serves no useful
purpose. Every copy installed consumes 300 bytes of memory,
increases clock tick interrupt service overhead, and
causes the setting of all but the last copy installed to be
fixed (it can no longer be changed from ON to OFF or OFF to
ON).
SILENCE ON - Turns SILENCE ON. Program sounds will no longer be heard.
Error messages are returned if SILENCE has not been
installed or if changing the setting is not possible.
SILENCE OFF - Turns SILENCE OFF. Program sounds will now be heard.
Error messages are returned if SILENCE has not been
installed or if changing the setting is not possible.
SILENCE ? - Program information (you're reading it).