IACCBBS went online in 1985. It was a public bulletin board system operated on behalf of the Irish Amateur Computer Club.

The system ran on a Commodore 64 microcomputer, with ultimately 3 floppy drives for storage (1541, 8250 dual drive). The system software (SIBBS) was developed by club member Fergus McDonald and was written entirely in assembly language.

It provided a combination of command line interpreter and menu driven interfaces, and supported access from text-based and Viewdata style terminals.

It was the third public BBS to go online in Ireland (the first being "Hook Up" running on an Atari 400, which was established by another club member Joe McCormack in 1984).