Re: Apple IIgs music library

[Antoine Vignau <antoine.vignau@laposte.net>]

Le vendredi 11 janvier 2013 00:08:11 UTC+1, dagz a écrit :
> Will that interfere if I have a song playing using tool 219 (or 220)?

Nope.

Let's consider you have:
- all your sound waves and effects in DOC RAM (the 64 KiB sound memory)
- a knowledge of the Ensoniq chip (turn on/off oscillators, etc.)
Then, it is a matter of knowing:
- where in memory is Carmen Sandiego (oops, no), where in DOC RAM is my sound effect
- tell a pair of oscillators to play a one-shot sound (set DOC RAM ptr, sound length, volume, etc.)

And understand the power of the Apple IIgs: you have 32 independent oscillators. They mainly work in pairs, keeping two for the tempo, that leads us to 15 (can be) stereo voices. Really really powerful.

But, if you want to master that, read some books:
- Le IIgs épluché (http://www.apple-iigs.info/docprogrammation.php)
- Apple IIgs hardware reference (http://www.apple-iigs.info/dociigs.php)

Antoine