This is not a tutorial. But I have something cool for you. See I am in the making of my 5th iOS Game, then in need of some 8 bit voice. Freesound.org, gives me some. But I need to have it say a certain customized words. So I went on and search for the Atari Simulator for Mac. Found some, but I can't figure out how the heck do I install the speech simulator.
Upon searching further I encountered this cool online Voice Synthesizer that sounds exactly like the one I want - Atari version! So without further delay here is:
Atari Voice Synthesizer
How To Get The Sound as File