English chip artist benanderson89 has made a SN76489a vsti. I normally don’t cover vsti type stuff, but it looks like he aiming for something pretty accurate he writes:

The internal workings of this VST are based off of the actual data-sheets for the real SN76489, mimicking the internal circuitry and flow logic as close as possible. More specifically, this chip emulates the SN76489A (which used a 16-step register) as used in the Sega Master System and Game Gear.

The VST is pure hardware emulation, no decimators, bit-crushers and samples are used at all.

The VST sports the following specs (some are still very buggy);

Tone channel: 15 different vibrato levels, 4 different vibrato speeds and 4 different vibrato delay times and an ADSR envelope with an overall volume level. True 4-bit quantization on all data inputs (except pitch frequency) and final volume output, frequency limited to that of the real chip, velocity sensitivity.

Noise channel: 3 different noise frequencies, true pseudo random noise generated by a 16 step shift register with an XOR feedback loop, the same ADSR functions and quantized output as the tone channels, velocity sensitivity.

No downloads yet, but we will keep you posted.

via Forums | 8bc.org – Online Chiptune Media Sharing.

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