The Abacus Logo

Atari Bay Area Computer Users Society

P.O. Box 22212, San Francisco, California 94122
(415) 469-7924 (Voice)

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ABACUS is an informal group of current and former Atari users who meet once a month to discuss various computer-related topics, and to share information, tips, and rumors. Established in 1981 by former Antic and STart publisher James Capparell, ABACUS is the oldest continuously active Atari user group in the San Francisco Bay Area.

General Abacus Meetings

Our meetings are generally held on the first Saturday of the month on the Second Floor of the Potrero Branch of the San Francisco Public Library located at 1616 20th Street (between Arkansas and Connecticut Streets) in San Francisco. Since we occasionally have conflicts (such as Labor Day in September), it is best to check your newsletter (if you are a member) or e-mail our fearless leader, Roger Sinasohn, at Meetings are from approximately 1pm to about 5pm. Meetings are FREE and open to everyone.

See what's happening at the next meeting.

At our meetings, members share information on the latest Atari and other computer-related news and give demonstrations of new products. We also offer help and guidance to any users needing it.

Special Events

We also publicize special events of interest to our members, such as the Classic Gaming Expo. See our Special Events listing for details.

Membership Information

Dues are $20.00 per year for which you receive the monthly newsletter and support one of the last active Atari-based computer clubs. You can join at the meetings or by mail. The membership application is available on-line!

The Newsletter

A monthly newsletter containing the latest Atari and other computer news, features and reviews as well as humor, product info, and club announcements is mailed monthly to all ABACUS members with full membership. Articles come from a wide range of sources including the Internet, ABACUS members, and other user group newsletters. Each newsletter contains an estimated 5-10 pages of information.

Software Library

Browse through our extensive software library full of shareware and public domain software. The library includes old favorites as well as the latest versions of the newest software, ranging from graphics and desktop publishing to games, MIDI, utilities and other useful applications, all at a low price.

New! The ABACUS FTP Server is online! Download software, images, videos, fonts, and more!


If you have any other questions, please e-mail the club president, Roger Sinasohn, or check out some of the other online Atari links and resources.

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