Bob broke through many barriers in LA in '84.... if he was in a straightjacket then, all the Olympic announcers who preceded him were in solitary confinement on Devil's Island.
I was shocked at my first games in Munich in '72; there was less information than I got at my high school meets when the guidance counselor would run a speaker truck up to the track and make announcements from the front seat.
But IAAF/IOC mandate in '72 (and pretty sure until Bob took some liberties in LA), the protocol consisted of this, for example. A chime would ring and the announcer would say, "now on the scoreboard, the start list for heat 1 of the men's 100 meters." If the reigning Olympic champion or the WR holder was in the race, he would also say, "please note in lane 4, the ........."
Gun would go off, they'd race, and a few minutes after the race the announcer would say "the results are now on the scoreboard."
And that was that. Same for every race.