The first generation of Maxxum cameras (7000,9000,5000) used the same dedicated flash shoe from the earlier, manually-focusing, Minolta X- series of cameras. For auto exposure mode, the camera controlled the flash. Minolta made lots of manual-focus, and auto-focus flash units that used this same, dedicated shoe and it will provide auto-exposure on various Minolta and Maxxum cameras -- depending on the flash & the camera. They both have to have the same dedicated shoe. No other camera brand used that exact, dedicated shoe (except some Seagull-made cameras made in China).
You cannot get any auto-exposure features by using these Minolta & Maxxum dedicated hot-shoe flashes and any other cameras -- except particular Minolta & Maxxum (and Seagull) cameras.
You can get them to work in manual mode -- if the camera has a hot shoe -- but that's it. Just because you set "Camera XYZ" to "AUTO MODE", and the flash fires, does not mean that a correct exposure will result.