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 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

Use Cases

This project has been used in:

Other sound chips from the same author