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Sega Master System

the predecessor to Genesis.

surely had better graphics than NES, but its sound is subject of several jokes.

this console is powered by a derivative of the Texas Instruments SN76489.

effects

  • 20xy: set noise mode.
    • x controls whether to inherit frequency from hannel 3.
      • 0: use one of 3 preset frequencies (C: A-2; C#: A-3; D: A-4).
      • 1: use frequency of channel 3.
    • y controls whether to select noise or thin pulse.
      • 0: thin pulse.
      • 1: noise.