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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).