Nokia made some wonderful monitor Test software(Freeware!). If you can port it out as 640x480 via a video card to your set, it'll work. The only machine I have that can do that is an old IBM from the early Pentium days that takes about 5 minutes to boot up. Sync is rock solid.
I've not used it for a while - I have a VA62 and about 5 or 6 working bar-dot generators, including my DIY one from this
EDN magazine article.
Cheers,