Re: How is the IIgs beep generated?

[Mitchell Spector <mitch2gs@hotmail.com>]

"Michael J. Mahon" <mjmahon@aol.com> wrote:

>Michael J. Mahon wrote:
>> Mitchell Spector wrote:
>> 
>>>     Here's a question, one I've been curious about the past twenty years:
>>> Can you reproduce the IIgs "beep" on a stock Apple IIe?
>> 
>> 
>> It can be played using DAC522, but with 5-bit rather than 8-bit
>> precision, so it will be a little "rougher".  Still, it would be
>> a nice hack.  ;-)
>
>Can someone point me to the "bong" sound in the IIgs ROM?
>
>I'll extract it and try it out on SOUND.EDITOR.

    Not possible. It isn't a digitized waveform (like, say, the "Apple II!
shout in the ROM 3 firmware). In fact it isn't even produced by the 
Ensoniq chip.

    It's likely just toggling the speaker, very similar to how the Apple
II/+/e/c produce their own "beep" (the IIc+ has a different tone).
The IIgs "bonk" sounds very UN-Apple II-ish or IBM PC speaker-ish
for that matter, especially once you start playing with the pitch.
I wonder how it's produced, is it because of the 2.8 MHz CPU
or some extra sound circurity that is not found in the 8-bit Apple II,
but not part of the Ensoniq either?

    So the question remains: Can you re-produce the IIgs beep
on a stock Apple IIe? (digitizing it doesn't count!) :)

Mitchell Spector