Sunday, March 03, 2013

A26F: Custom Waveform and Three Voice Polyphony


The Atari 2600 sound chip is limited to two programmable voices, each with a selection of pre-defined waveforms.

This is a demonstration of a custom waveform channel that can be used - to some degree - to overcome some of the limitations imposed on the Atari 2600 sound chip. The custom waveform is user-defineable and can be changed during runtime.

The custom waveform also allows for a much wider range of frequencies. Additionally, the custom waveform can be used at the same time as the main two oscillators, thereby - with some clever sequencing - giving rise to three-voice polyphony.

This feature will be included in the next A26F firmware update.