DYSS (pronounced DY-double-S; 999 AM) Super Radyo is a radio station owned and operated by GMA Network.

It was then owned by Loreto F. de Hemedes Inc. through DZBB in Manila, later the Republic Broadcasting System of Robert "Uncle Bob" Stewart.

Two years later, the assets of RBS were sold to the triumvirate of Gilberto Duavit Sr., Menardo Jimenez and Felipe Gozon due to the changes in media ownership laws.

On July 17, 1989, the station switched to a news and public service format, now known as simply DYSS.

The following year, DYSS, along with its sister stations DYSS-TV and DYRT, transferred to its current home at the GMA Skyview Complex in Nivel Hills.