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JT89 FPGA Clone of sn76489an hardware by Jose Tejada (@topapate)

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sn76489an compatible Verilog core, with emphasis on FPGA implementation and Megadrive/Master System compatibility.

This project aims to make a Verilog core that will:

  • Produce signed output waveforms, with no DC offset
  • Produce accurate volume
    • Have volume limiting like reportedly Master System had
    • Different volume settings for noise channel as reported
    • Test if Megadrive 2 version had different volume and apply it
  • Reported variations on noise signal length
  • Use one single clock for all registers, making it easy to synthesize and constraint on FPGAs
  • It will fit well with JT12 (https://github.com/jotego/jt12) in order to produce the Megadrive sound system
  • Have separate output channels, so they can be mixed using the interpolator before the sigma-delta DAC

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sn76489an compatible Verilog core, with emphasis on FPGA implementation and Megadrive/Master System compatibility

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