The station soon added some sports talk in evenings .
The station soon took a full - time sports format in 1990 with the lone exception of The Rush Limbaugh Show , which KNBR carried from 1988 until 2000 .
The station soon added some sports talk in evenings , and took a full - time sports format in 1990 with the lone exception of The Rush Limbaugh Show , which KNBR carried from 1988 until 2000 .