High Quality Content by WIKIPEDIA articles! The Tandy 10 Business Computer System was a short-lived product developed by Radio Shack in the late 1970s as a business-oriented complement to their TRS-80 Model I desktop computer. Released in 1978, the Tandy 10 was built for Radio Shack by Applied Digital Data Systems, and was only sold by Radio Shack's dedicated computer center stores.The system did not sell in large numbers and was discontinued in late 1980, with Radio Shack's next business system being an extension of the TRS-80 product line, the Model II, released in May 1979.