To apply for the RT-middleware to mechatronics, we are interested in reliability or system-size. At present, the RT-middleware needs a PC system, thus, it is important to examine the scale of RT-components. In this Paper, as one of the minimal scale, we try to provide RT-components that provide basic I/O service by PC-based direct hardware control. First, RT-components, which wrapped DA and Counter PC-interface-board, are proposed. These RT-components have data-ports for basic I/O, service-ports for ordering application service, and configurations for PC-board unique setting. As an example system, we make a simple DC-motor control system with an RT-component for very basic control.