[sdiy] TI 76477 Space Invaders sound chip detailed analysis

Tim Parkhurst tim.parkhurst at gmail.com
Wed May 23 08:33:23 CEST 2018

You should also check out what the amazing Thomas Henry managed to do with
the 76477. Even got a few octaves of CV response from it.


Tim (if I had a quarter for every 76477-powered video game I played...)

On Tue, May 22, 2018 at 9:16 PM, cheater00 cheater00 <cheater00 at gmail.com>

> I've just found this while surfing the internet, an analysis of the 76477
> sound chip's digital sound circuits. This includes the unique
> shift-register based noise circuit, as well as the noise filter circuit
> (which is analog):
> http://www.righto.com/2018/05/inside-76477-space-invaders-sound.html
> Here's an earlier anysis of the analog circuitry:
> http://www.righto.com/2017/04/reverse-engineering-76477-space.html
> I wonder if anyone has tried cloning the chip for synth use, with modern
> features like eg tuning.
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