Atari Message Information System

The Atari Message Information System (AMIS) was one of the first BBS (Bulletin Board System) software packages available for the Atari 8-bit family of computers.

The original AMIS BBS software was written in the BASIC programming language by members of MACE (Michigan Atari Computer Enthusiasts). The program included instructions for building a "ring detector" circuit for the board maintainer's modem to enable it to answer incoming calls – modems at the time were most often capable of making outgoing calls, but not receiving incoming ones.

A sector editor was required for the BBS maintainer to manually allocate message space on their disk, one hex byte at a time.

The software was released into the public domain, and was heavily modified by enthusiasts and BBS maintainers. As such, several versions of AMIS exist, including:
* Standard AMIS
* MACE AMIS – from the Michigan Atari Computer Enthusiasts
* Fast AMIS
* Comet AMIS – by Matt Pritchard & Tom Johnson of Algonac, Michigan; originally designed for the MPP modem (which used the joystick port, not the regular I/O or 850 Interface ports. At the time this was a very popular low cost modem, that had no software written for it, until John Demar developed a driver to enable software to communicate with the joystick port as if it were the I/O port) and modified to be used with other types of standard modems. The final version featured many automated tasks, usage logs, passwords, private mail, multiple message bases and support for hard drives and MYDOS, and was on the cutting edge of AMIS/Atari 8-bit BBS technology.
* TODAMIS 1.0 – for 1030/XM301 modems, written in 1986 by Trent Dudley

Fast AMIS was a heavily modified version of AMIS written by one of the original AMIS programmers, Mike Mitchell (Baudville BBS - Garden City, MI), and newcomer Mike Olin (Molin's Den BBS, Northville, MI), written in Basic XE by Optimized System Software.