Old NTSC tricks: 240p?

On Tue, 17 Mar 2015, Dale H. Cook wrote: The Wikipedia article says that the non-colour standard was only a recommendation, and that this Committee was reconstituted to standardize colour television (and in my opinion drop the analog signal definitions). The same article then says "NTSC color encoding is used with the System M television signal". The German Wikipedia says that "NTSC is a US American institution that defined the first colour television standard [...] The term NTSC was later adopted as a generic description for this television system." And as I recall it, what you call NTSC is what we call "CCIR System M" - without colour (the CCIR and the ITU being much older than the NTSC). So as I understand it, the NTSC started to define a television signal standard and dropped it in favour of the CCIR standard, but became the insitution to define the colour standard in the US. Christian