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From: ephram@violet.berkeley.edu.UUCP
Newsgroups: comp.sys.ibm.pc
Subject: Re: Turning on sound and keyboard info.
Message-ID: <2617@jade.BERKELEY.EDU>
Date: Thu, 26-Feb-87 02:00:08 EST
Article-I.D.: jade.2617
Posted: Thu Feb 26 02:00:08 1987
Date-Received: Sat, 28-Feb-87 03:17:31 EST
References: <262@crys.WISC.EDU>
Sender: usenet@jade.BERKELEY.EDU
Reply-To: ephram@violet.berkeley.edu ()
Distribution: comp
Organization: University of California, Berkeley
Lines: 31
Keywords: sound, keyboard

In article <262@crys.WISC.EDU> jojo@crys.WISC.EDU (Jon Wesener) writes:
>
>	I'm currently writing a game in C and want to add sound.  The problem
>is that the all the sound routines I have will play a frequency for some
>duration. (usually by busy waiting)  What I'm looking for is something
>similar to Turbo Pascal's soundon and soundoff routines.  These routines
>turn the speaker on and have it play a frequency without supervision of
>the cpu.  Does anyone know how to do this?
>

I think the turbo routines do it by attatching to the time of day interupt
but I am just stabbing in the dark on this one.

>Secondly, I know how int 9 and int 16 work for getting keyboard input,
>when you press a key, the chip in the keyboard signals a hardware int. through
>int 9.  Int 9 then reads in the scan code, etc from port 60(?)  From what I
>hear, there's another port (61?) which can tell you if a key is being pressed.

The keyboard sends out 2 codes for each key.  When the key is pressed it
sends out the scan code we all know about.  In addition, however, the
scan code + 80 (hex) is sent when the key is released.   I don't think
there is another port that tells you about weather (sp?) a key is down or not.

>
>thanx in advance,
>--j
>
your welcome  :-)   I hope this is of service.


ephram@violet.berkeley.edu