Good references for ANSI terminal emulation?

I'm struggling trying to create an accurate telnet client with ANSI emulation. The basic codes are easy enough and well documented, but there are a lot of obscure codes to do things like 'set terminal mode' to 'vertical editing mode' which I can't find good descriptions for. I can't even figure out if a pure ANSI terminal supports wrapping to the next line when you hit the edge of the screen, or if that is controlled by an escape sequence. To further confuse things, a lot of people lump the DEC terminals in with discussions of ANSI terminals, and although they are close they are not the same. DEC extended a lot of things. I've been googling, reading source code, and experimenting. It's slow and painful. Does anybody have a good reference they would recommend? Thanks, Mike