Noise/Tone Generator (AUD0/1)
The TIA is capable of generating different flavors of pulse and noise out its two oscillators (or channels) AUD0 and AUD1. Each oscillator has a 5-bit frequency divider and a 4-bit audio control register which manipulates the waveform. There is also a 4-bit volume control register per channel.
Read more about this topic: Television Interface Adaptor
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