I was just wondering if anyone knows what the analog video signals
going from the computer to the monitor look like or what they are
called.
There are a lot of things that could qualify as "analog video,"
but the sort which most commonly are found going from a PC
to its monitor (the "VGA" interface) are three separate signals
(one each for red, green, and blue) which have an amplitude of
0.7V p-p, and in which the most positive excursion of the signal,
with respect to the blanking level, is considered "white". (Note
that you will often see the "white" level for each channel as 0.7V
positive with respect to the video return pins, but technically
VGA is an AC-coupled system and the white level is supposed to
be referenced to the blanking level, not "ground.") Oh, and this
assumes a 75 ohm termination impedance.
The vertical and horizontal sync signals are seperate, each on its
own physical line, and are positive-true pulses at standard TTL
levels.
Also, is there a microcontroller that could generate such signals?
A microcontroller by itself would likely not be fast enough to
generate anything but the crudest video; for even the lowest
standard format (640 x 480 at 60 Hz), you need a pixel rate
of a bit over 25 MHz. Simple pattern generation (color bars,
etc.) can often be done with just a microcontroller, though.
Actually, I put together just such a generator a number of years
back, for the purpose of EMI testing of monitors. What is
it you're trying to do, exactly?
Bob M.