[Cyberdog]

I believe it's the one mentioned in the article about how to achieve a color NTSC signal by just outputting ones and zeroes with proper timing.

It begs the question what was done in parts of the world that didn't use NTSC, though.

[fsckboy]

the other video standards (Europe used PAL) aren't much different in principle than NTSC, just some different timing and encoding parameters, the same D to A techniques work. PAL is higher bandwidth (and higher quality) than NTSC and Woz's timings were on the edge for NTSC so PAL versions didn't do color till a little later.