connecting vga card to rgb tv

[starcrudph]

Ive bought something i dont understand. Now here's my question; Can I use any built in or agp video card and just wire it into the tv? this chassis cannot be used as a tv the seller said to me, it's only function is for output, sort of a "dumb" engine.  Help i really dont know if this is an arcade monitor or what. it's basically a chassis and he said i could use an old picture tube to hook it up with.



If i get to solve this, is there software for dos based apps like chris' doscab and mame dos? I mean for gettting perfect or correct resolutions and run it off a pc/rgb tv