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== External links ==
* Wikipedia: [https://en.wikipedia.org/wiki/Texas_Instruments_SN76477 Texas Instruments SN76477]
* [http://www.righto.com/2018/05/inside-76477-space-invaders-sound.html Inside the 76477 Space Invaders sound effect chip: digital logic implemented with I2L]▼
* [http://docs.bgmicro.com/pdf/ics76477a.pdf ICS76477a Sound Chip], BGMicro Electronics compilation
* Panels, PCBs, and bundles from [http://synthcube.com/cart/index.php?route=product/search&filter_name=henry synthCube] for [http://www.birthofasynth.com/Thomas_Henry/Pages/SN-Voice_main.html The SN-Voice Project].
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* [http://srv4.electro-music.com/forum/viewtopic.php?t=17529&postorder=asc Thomas Henry's SN76477 Super Controller Module], electro-music forum, Apr 2007
* [http://electro-music.com/forum/viewtopic.php?t=68116 VC Noise Source and LFO] by Thomas Henry, Jan 2017
* [http://www.righto.com/2017/04/reverse-engineering-76477-space.html Reverse engineering the 76477 "Space Invaders" sound effect chip from die photos]
▲* [http://www.righto.com/2018/05/inside-76477-space-invaders-sound.html Inside the 76477 Space Invaders sound effect chip: digital logic implemented with I2L] by Ken Shirriff
* [http://electro-music.com/forum/topic-63624.html The SN-Exerciser], electro-music.com forum, Jan 2015
* ''[https://drive.google.com/file/d/0Bx5_5krPS9HMcThRRHRObjRwMUk/ Electronic Music Circuits: The Reprints, Vol 1]'' contains:
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