17 Mar
2015
17 Mar
'15
5:45 a.m.
On Mon, 16 Mar 2015, John Foust wrote:
I'm trying to understand at a low level how some
early computers
and game consoles generated a non-standard form of NTSC.
The Wikipedia http://en.wikipedia.org/wiki/Low-definition_television says:
"Older video game consoles and home computers generated a nonstandard NTSC
or PAL signal which sent a single field type which prevented fields from
interlacing. This is equivalent to 240p and 288p respectively, and was
used due to requiring less resources and producing a progressive
and stable signal."
[...]
This has absolutely *nothing* to do with NTSC or PAL (or SECAM or
whatever). NTSC etc. are colour encoding standards and don't describe in
any way how a image signal is generated (fields, syncs, timing). They only
describe how to put colour information into the signal.
Christian