ĭue to limited number of voices in those primitive chips, one of the main challenges is to produce rich polyphonic music with them. The SID was a very technically advanced chip, offering many other features including ring modulation and adjustable resonance filters. Unlike the Game Boy, the pulse channels on the Commodore 64 allowed full control over wave duty cycles. The Commodore 64, however, used the MOS Technology SID chip which offered 3 channels, each switchable between pulse, saw-tooth, triangle, and noise. The Game Boy uses two pulse channels (switchable between 12.5%, 25%, 50% and 75% wave duty cycle), a channel for 4-bit pulse-code modulation (PCM) playback, and a pseudo-random-noise generator. Two notable examples of systems employing this technology were the Nintendo Game Boy portable game console and the Commodore 64 personal computer. Available waveforms often included pulse wave (whose timbre can be varied by modifying the duty cycle), square wave (a symmetrical pulse wave producing only odd overtones), triangle wave (which has a fixed timbre containing only odd harmonics, but is softer than a square wave), and sawtooth wave (which has a bright raspy timbre and contains odd and even harmonics). Common waveform generator configurations usually included two or three simple waveforms and often a single pseudo-random-noise generator (PRNG). A waveform generator usually produces a basic geometrical waveform with a fixed or variable timbre and variable pitch. A waveform generator is a fundamental module in a sound synthesis system.
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