Maryland-based technology firms are joining together to repeal the state’s new 6 percent computer services tax — a tax they say will hurt Maryland technology firms.

The Maryland Chamber of Commerce, which launched the Web site FighttheTechTax.com with the Tech Council of Maryland, has “a statewide grassroots effort underway,” said Will Burns, the Chamber’s communications director. The group — whose members include more than 30 companies, local chambers and associations — plans advertising, outreach to member companies and coordinated lobbying efforts.