Tuesday, January 2, 2018

I think I finally understand how Star Rider's manchester/biphase decoder works

I've been scared to dig into one of the Star Rider schematics, the one with the "biphase" decoder on it.  This circuit is how it grabs the picture number from the laserdisc video signal, and how it also decodes the other biphase (aka manchester) data that exists on the disc.

I've put verbose comments on the schematic page so that I never forget what I've learned.  I hope someone finds it interesting as this represents somewhat of a victory for me :)

Since the jpg is large, I've hosted it on my wiki.  Click here here to view.


  1. Interesting...but pretty much impossible to read (image too small). Anyway congrats for the good work on Star Rider!

    1. Sorry for the inconvenience. I've moved the file to my wiki so that its resolution doesn't get reduced.

    2. Nice, thanks! Surely an interesting reading.

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