You're better off finding an existing ASCII teletype. Then all you need is a USB-to-RS232 interface (FTDI and PL2303 ones work on OS X) and, depending on the machine, an RS232 to 20ma current loop interface, or a modem. Then simply edit /etc/ttys to enable getty on the appropriate interface.
Original vi has what is called 'open mode', which is effectively a one-line window intended for printing terminals. Neither nvi nor vim provide this, but line mode (ex) is more efficient anyway.
jlgreco
Hmm. Imagine a "teletype" jury-rigged out of a state of the art laser printer with Vim running on it. You would just have to position yourself or the printer so that every time the screen updated the next sheet of paper would land somewhere convenient.
Original vi has what is called 'open mode', which is effectively a one-line window intended for printing terminals. Neither nvi nor vim provide this, but line mode (ex) is more efficient anyway.