I currently have in my possession a SCART (Euro) to HDMI converter which upscales incoming RGB signals to 720p. That in itself is fine and it looks great... as long as nothing is in motion. It sends out a 720p 60 signal. 60 frames per second. I am inputting a 240p signal, 60 frames per second. But the converter seems to be grabbing a full frame (two fields) and then doing weird-ass stuff with it. This causes artifacts in the 720p conversion. I can't understand why it is waiting for a full frame when it is sending out a 60fps signal in the end.
Check out this picture from Street Fighter 2 for some system called the PC Engine:

This is unacceptable. Does anyone know of such a converter/scaler that will scale on a per-field basis, thus eliminating any/all interlacing artifacts in the output display? Oh, and it needs to be something that I can actually acquire, not like an XRGB of which there are only a couple hundred in existence and nearly impossible to get. Also, XRGBs don't have a Euro SCART connection, only the wacky Japanese version.
I must use something like this because in order to record game footage from a 240p system, I must use composite. My capture card will not see component video at 240p. It will, however, see component video at 720p and above. HDMI as well. 480p only over HDMI (weak).