TCPs based on an appliance or device are categorized as Machine-type.

Machine-type TCPs do not have any strict rules as to their appearance, but they generally either resemble the basis of their typing or have the basis of their typing incorporated into their body in some way.

Machine types do not have a consistent sort of ability, but all machine types require some kind of input in order to produce some kind of output.

All known machine types are listed below.