Versamat is a Kodak trade name for their automated film processing units, for both with versions for black and white as well as color-capable.
With long rolls, however, there are a lot of problems because the film passes over many rollers.
Most Versamats use developer, followed by a stop bath, fix, water wash, and finally conditioner.
The Versamat also has control over the height of the liquid/chemical, as well as speed of the film, to determine how long it is in each solution.
Usual speeds are 25-35 fpm, with a developer temp of 90 F–95 F and a drybox temp of 128–135 F Put simply, the developer converts the latent image to a visible one, fix stops the development, water washes off the fix, and conditioner helps to restore the hardness of the emulsion.