RTS/CTS needed. Levelshifter or usb dongle?

[RSvedman]

I wish to connect my Visual 550 (old serial terminal, vt100 + tektronix 4010 emulation) to my new raspberry pi model B+, which will the run headless with the terminal as console (for the purpose of demonstrating the terminal and being generally coolskool). The terminal requires hardware flow control when doing vector graphics (it was made in 1983 and is very slow), so which is better? I want to reliably get the console on the serial line, is this even possible with a usb device, they seem to change device nodes between reboots..

If I want to build the pi into the terminal, It would of course be good to have all four USB ports free and not needing a hub..

What chip should I buy to make a rs232 port out of the ttl uart on the pi?

[jdb]

MAX3232 is your friend. It does the level conversion for you.

RTS/CTS are available on a B+, they are GPIO16/17 ALT3 for CTS/RTS respectively.