[sdiy] TI 76477 Space Invaders sound chip detailed analysis

[Ullrich Peter]

Hi!

You can load some German articles about the SN76477 from  my homepage, as I built my first synthesizer with the SN76477 in the 80ies.

You can find them via http://www.ullrich.at.tt / Music (Left Menu) / Synthesizer-DIY (Top-Menu)

Ciao
Peter

http://www.ullrich.at.tt (my webpage)
http://www.rc100-usb.at.tt (Roland Sampler Tool)
http://synpro.heimat.eu/datadial.htm (DataDial Synth Addon)



Von: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] Im Auftrag von info at synthcube.com
Gesendet: Mittwoch, 23. Mai 2018 18:00
An: Tim Parkhurst <tim.parkhurst at gmail.com>; cheater00 cheater00 <cheater00 at gmail.com>
Cc: synth-diy mailing list <synth-diy at synth-diy.org>
Betreff: Re: [sdiy] TI 76477 Space Invaders sound chip detailed analysis

So I remember first being exposed to the SN76477 via Omni Magazine in what must have been sometime from about 1978-1980. We are offering a $25 store gift certificate to the first person to send us the article (or a link to it)-- i vaguely remember breadboarding a simple circuit with the SN76477 on  Radio Shack breadboard...

Anyway, other than the Thomas Henry SN Voice and Supercontroller, I haven't seen many (or any) modular synth designs that use the chip... wondering why?

They're still plentiful and relatively cheap given the range of capabilities... maybe we'll sponsor a module design contest around the SN76477 to see what emerges...
-------- Original Message --------
Subject: Re: [sdiy] TI 76477 Space Invaders sound chip detailed analysis
From: Tim Parkhurst <tim.parkhurst at gmail.com<mailto:tim.parkhurst at gmail.com>>
Date: Wed, May 23, 2018 2:33 am
To: cheater00 cheater00 <cheater00 at gmail.com<mailto:cheater00 at gmail.com>>
Cc: synth-diy mailing list <synth-diy at synth-diy.org<mailto:synth-diy at synth-diy.org>>
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.

http://www.birthofasynth.com/Thomas_Henry/Pages/SN-Voice_main.html



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




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