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A fantasy sound chip created by The Beesh-Spweesh! and jvsTSX for the Hexheld fantasy video game console. Its design employs linear-feedback shift registers (LFSR) for sound generation. This technology is used in many random number generators to produce noise, but it is also capable of producing other tones.

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Capabilities

  • Three noise channels
  • One “slope” channel capable of generating a variety of saw waves
  • Stereo sound output
  • 4-bit volume control per channel
  • 2-bit master volume control

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Effect Commands

  • 20xx: Load LFSR value (low byte)
    • On the slope channel, this sets its accumulator (from 00 to 7F)
  • 21xx: Load LFSR value (high byte)
  • 22xx: Write to I/O port A
  • 23xx: Write to I/O port B

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