TRON is a real-time OS that has been developed and developed by TRON Project since 1984. There are several types of TRON, including ITRON for embedded devices and BTRON for PC and PDA. ITRON is embedded in devices such as mobile phones, automatic engine controls, and video cameras. As a BTRON-specification OS that runs on a PC, an OS that can handle more characters (hundreds of thousands of characters compared to thousands of JIS characters) has been created.