Abstract The design of a transputer link to an RS232 serial interface tram (transputer module) is presented. This enables a transputer to communicate with serial peripherals via a standard Inmos transputer link. The tram uses the Motorola MC68HC805C4 8-bit microcontroller to interface between the transputer link and the RS232 serial line. This solution allows a high level of programming flexibility and can be used in any transputer motherboard which has a spare size one slot. The results of performance measurements are also shown. These show how a shortcoming in the design was detected and rectified.