[sdiy] TI 76477 Space Invaders sound chip detailed analysis

[Chris Juried]

The SN76477 brings back many memories, thank you for the reminder as I need to get my hands on a few... :)
Sincerely,   
  Chris Juried  
Audio Engineering Society (AES) Member  
InfoComm-Recognized AV Technologist
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    On Wednesday, May 23, 2018, 1:11:46 PM EDT, John Speth <john.speth at andrews-cooper.com> wrote:  
 
 
I got the chip from RS in the 70’s.  It was fun to play with but compared to what one can do today, it’s just a historical novelty today.  I still have that chip plus the folding paper that was stapled to the back of the card.
 
  
 
JJS
 
  
 
From: Synth-diy <synth-diy-bounces at synth-diy.org> On Behalf Of cheater00 cheater00
Sent: Tuesday, May 22, 2018 9:16 PM
To: synth-diy mailing list <synth-diy at synth-diy.org>
Subject: [sdiy] TI 76477 Space Invaders sound chip detailed analysis
 
  
 
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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