In 1989 Jack Porter opened a small bulletin board system (BBS) in Madera called Zen Den Systems. The one-line BBS ran on the commercial Wildcat software, while many of the other boards in the area used a free software called Opus. ZDS was a part of the FIDO-Net system at the time and there was controversy with the Fresno boards because of it. For the next five years, the bulletin board grew and was named the 11th most popular board in North America by Boardwatch Magazine in 1991.