[QuadList] NBC Control System

[Tony Quinn]

In message <c58.3fb3198a.370baf9d at aol.com>, Chill315 at aol.com writes
>I can see the need for two line delay.  With the 180 degree flip of the
>color each line, that would be a necessity.  Also would it not depend
>on the path length through the switcher?

Surely NTSC doesn't have any VAS.

I can remember joining the BBC in 1980 and being intrigued by early and 
late sources on the Network Mixer.

Imagine having Studio 6 to transmission and having a VT machine playing 
a 25 minute cartoon into that studio, and then at network Control being 
able to cut to that VT machine direct with no discontinuity of any sort. 
The EARLY VT source routed via the studio was timed to be synchronous 
with the LATE source direct. All before the days of frame stores.

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