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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 so unds. 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 c lock 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
- a llowed) 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 installe d 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 duri ng 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 t he setting is not
- possible. SILENCE ? - Program information (you're reading it).