Apple Computer Inc. was established on April 1st, 1976 and incorporated on January 3rd, 1977. Apple first started advertising its products in the late 1970s.
In the 80s ads were text-heavy and light on images, as were many computer and technology ads from that era. Here’s an amazing compilation of some of Apple’s most notable advertisements from the 1970s to 1980s. (via vintage.es)