Object-code compatible is a computing term meaning that object code

Object code

Object code, or sometimes object module, is what a computer compiler produces. In a general sense object code is a sequence of statements in a computer language, usually a machine code language....

 can move freely between two different kinds of computers and can be expected to function in the same way.

Usually, compatibility is expressed in terms like backward-compatible, which means that the usually-newer computer has every feature the old one did, plus additional functionality that is not supported on the old machine.