> I'm planning to make a video capturing device using a PIC
> and a PC parallell port.
>
> What I have is a composite 1 V p-p video signal (monochrome, no color bursts)
> (The signal is CCIR, 50 Hz field frequency, interlaced)
>


        If your picture will sit still for a long time you might consider
a cheap approach.  Use the Pic timers to wait a short time from the
horizontal sync pulse, grab a quick sample, convert the sample and store
it.  The next time the frame is on this line, your short time is a little
longer to grab the next pixel.  If things go really fast, you can get one
sample every line, if not every other line or so.  This method will
require at least 400 frames to get the picture, but you save on the Video
ram and the flash DAC.

hope this helps,
Fred
fthompso@mail.win.org