And the fortune it cost. My Amiga based local BBS had a pile of them and most online fellows had one while I couldn't even afford a Zyxel but had to connect through a terrible 2400bps unknown name one. Thankfully it had at least Zmodem which was almost new then. Good ol' times...
I can recall when 2400 was the new hotness and getting a hooky prototype 2400 from a colleague at Telecom Gold.
I think he used on of them on his FIDO BBS (Arkham Asylum)
Here's a USR modem recording for the daily nostalgia hit.