When Pentax and Nikon entered the autofocus segment, both used a similar passive array AF system as Minolta, but retained compatibility with their existing manual-focus K and F mounts respectively.
Canon, like Minolta, chose to change its mount completely, introducing the EOS 600-series a few years later, breaking compatibility with the former FL and FD lens mounts.
Canon's EOS system was the only fully electronic lens mount system, with no mechanical connections between camera body and lens: the autofocus motors were housed in the lens itself, rather than the camera body.
When Pentax and Nikon entered the autofocus segment, both used a similar passive array AF system as Minolta, but retained compatibility with their existing manual-focus K and F mounts respectively. Canon, like Minolta, chose to change its mount completely, introducing the EOS 600-series a few years later, breaking compatibility with the former FL and FD lens mounts. Canon's EOS system was the only fully electronic lens mount system, with no mechanical connections between camera body and lens: the autofocus motors were housed in the lens itself, rather than the camera body.
Minolta Maxxum 7000