A data processing machine with memory and less speed. Can use the information and instruction of other models in the same family (Family), without any modification, Moreover, it can also work in the network (the Network) as well, by connecting to a device known as a destination (Terminal). Can work with multiple tasks (Multi Tasking), and works with multiple participants (Multi User) this type of machine is normally used in large businesses. With prices ranging from ten million baht up to several hundred million baht. An example of a widely used mainframe is a bank's computer that is connected to a branch of the nationwide ATM