Per Wikipedia, the station currently known as 103X debuted in July 1979 on 103.1 FM, branded as “Z103”. It has generally remained with the CHR format in the 40+ years that have passed. As heard on this aircheck, at this point, 103X put an emphasis on rock, alternative and rhythmic pop selections, with less focus on R&B and hip-hop, in comparison to other Top 40 outlets at the time.