No, the 830 was introduced for the 400/800 series. It was the only Acoustic Coupler type modem made by Atari (meaning that you had to put your telephone handset onto the cups on the top of the modem).
<snip>
Well, there's Memory Lane for you. Maybe I'll write more about this later... it was a fun time.
Brilliant write-up, man.
I got one of these in 1999 with my first vintage machine (an Atari 800). To preface this, I was fifteen and incredibly bored. I later had the 850 interface as well and tried to call FamilyNET in Dallas from Kentucky on a calling card. It was utterly hopeless. I connected perhaps twice very late at night. Additionally, the acoustic coupler didn't quite fit my phone, which I quickly discovered was crucial for this to actually work. Eventually I got a 14.4k modem and started calling more local BBSes until I gave up on trying to create an authentic early 1980s technology exchange experience. Instead, I started using Telnet.