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From: dave@tygra.ddmi.com (David Conrad)
Newsgroups: comp.lang.c
Subject: Re: DIGITALIZED SOUND ON PC?
Summary: IBM PC/PS/2 has no volume control
Keywords: speaker, timer, volume
Message-ID: <522@tygra.ddmi.com>
Date: 20 Nov 90 10:49:28 GMT
References: <11516@j.cc.purdue.edu>
Reply-To: dave@tygra.UUCP (David Conrad)
Followup-To: comp.sys.ibm.pc.hardware
Organization: very little
Lines: 24

In article <11516@j.cc.purdue.edu> zhou@brazil.psych.purdue.edu (Albert Zhou) writes:
)
)   I want to output some digitalized sound signal to the speaker. The key-
)point I figured out is to control the volume of the speaker. While you
)can use "sound" to control frequency, Turbo does not provide direct access
)to the speaker. I searched throughout my DOS manual and could not find
)a interrupt for speaker. Does anybody have any clue on how to access speaker?

The IBM PC/PS/2's speaker does not have a volume control.  The speaker
is driven by channel 2 of the system timer.  Once channel 2 has been
programmed for the desired frequency two bits in a control I/O port are
used to indicate whether the speaker is on or off.  There is no need to
program the speaker directly as Turbo C's sound() and nosound() functions
provide complete access to it, however if more specific info is desired
follow this up in comp.sys.ibm.pc.hardware as this issue is not related
to C.
--
David R. Conrad
dave@tygra.ddmi.com
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