Shoot, I think the junkbox still has a 1200 baud modem card in it... also 2400, 9600, and maybe a 14.4K.
Sure was faster than the 60 words-per-minute of the old radioteletype setup I had, though.
I think I paid an extra $100 to Dell for mine, 14.4 being standard. At 28.8, I was rocket man.