This assumes the hardware from one ATM to another varies wildly. This is hardly the case. Thus, driver implementation costs are a very small factor, not the pri

This assumes the hardware from one ATM to another varies wildly. This is hardly the case. Thus, driver implementation costs are a very small factor, not the primary one. License restrictions are more likely to make them choose something else, like Sony chose FreeBSD for the Playstation. (Again, no need for drivers for many different configurations.)