RGB & LCD...

(sounds like a stevie wonder song, "r-g-b...and l-c-d..." (ugg, clearly I've had too much coffee). I have an old computer from the '80s and it has a frame buffer with RGB+S (sync) output on classic BNC connectors. Back in the day I'd go find a suitable (unbearably heavy) RGB monitor and 4 coax cables and connect the two. But I find myself without any RBG monitors these days. But I do have a bunch of new-ish LCD monitors which seem quite happy to sync up to pretty much anything. So, can I just (somehow) connect the RBG+S signals to a mondern LCD? Has anyone tried this? I haven't even thought about it electrically so this may be thinking out loud. Most of these lcd monitors seem to have VGA signals. I did once have a DW13 to RBG/BNC connector. And I think I have a DW13 to VGA adapter... Is that the right way to go? I don't know anything about the frame buffer in this thing. I suspect it's some sort of 640x480x8 device. I can do some digging. (it's a Symbolics 3630 lisp machine in case you are wondering, a so called "g-machine", where they put the original 3600 into a small number of FPGAs).