Here is some more info:

>1) What is the source impedance of the 0-0.5volts, i.e. how much >current
>can be drawn from these signals?  Could you tell us where the >signal
>originate from?

The original signal is from an analogue video source. It has been stripped
of the video and is left with just the sync pulses. The sync pulses are then
being put through a monostable so that the output stays high when the syncs
are present and only goes low when they are missing. This is what is being
fed into the PIC.

>2) Do you want the PIC to continuously send out a stream of bytes
> >indicating the state of these signals, or would you want to command >the
>PIC to send out a byte, either via a serial command or a hardware >switch?
>If it continuously sends, do you have any requirements for >the rate at
>which the data is sent, e.g. as fast as possible, or once >per second etc.

I would like the inputs to be checked for about 320 micro seconds each,
before it checks the next source (as this is the time it takes for 5 lines
of syncs). I would like the data to be sent once for each of the checks on
the different sources.

I hope this helps.

Thanks again.

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