Excellent! The "slowness" is due to the serial baud rate, it looks like. To get the REAL feel of a remote log-in to a mainframe in the '70s, set your baud rates to 110 or 300 baud. 300 baud was the fastest Ma Bell (the monopoly phone company back then) allowed on her wires. You had to have special permission to wire anything to the phone system in those days, so most modems were acoustic, with rubber cups you stuck a telephone handset into. If you had a wired modem, you had to pay extra, and AT&T assumed you were the size of General Electric and charged accordingly. Networking didn't really exist, but that didn't stop home computer users from setting up bulletin boards and exchanging files once the Disk ][ came out. We even did a few file transfers before that by playing cassettes over the phone, then loading them into our Apples. Needless to say, screens contained a whole lot less data back then than they do today. 300 baud, after all is only 30 characters per second, so it took almost 3 seconds to send a single 80-character line on screen.

I ought to try a TTY connection to my Mac one of these days just to see how it goes.