Re: A86: Interrupt questions

To: <assembly-86@lists.ticalc.org>
Subject: Re: A86: Interrupt questions
From: "Matt2000" <matt2000@gte.net>
Date: Tue, 21 Apr 1998 21:45:55 -0400
Delivered-To: assembly-86-outgoing@towerguard.unix.edu.sollentuna.se
Reply-To: assembly-86@lists.ticalc.org


>the interrupt is a little to slow to make most noises (since its 200
>times a second, no notes above 100 hz and no sampling rates greater than
>200 hz).

Yes, seem reasonable.

>pong probably (i really don't know) plays such a short note
>that it doesn't adversely affect processor time -OR- it oscillates the
>sound, say, every movement the ball makes or something.

or both :) Also seems reasonable. Maybe they use nops to slow it down and
jump to a small sound playing routine so no loss of speed is noticable.
Interesting! Maybe I will modify SQRXZ or frogger and add sound. Then just
send the authors the src and they will have an interesting version that they
may want to re-distrubute.


-Matt

i've never heard
>the sounds so i don't know ;)
>
>Matt2000 wrote:
>>
>> Is it possible to play sound with interrupts? The user int is called 200
>> times/second, but
>> the program I wrote uses virtually all the CPU power just to simulate the
>> sound using regular djnz loops.. going full speed.
>>
>> Some games use sound. How is this achieved? For example, in Zpong, if the
>> ball hits
>> something and it makes a sound, wouldnt that just stop the ball in its
>> tracks for the duration of the sound?
>>
>> -Matt
>
>--
>
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