K series RS232?

In East Germany, an unlicensed clone of the Z80, known as the U880, was manufactured. It was very popular and was used in Robotron's and VEB Mikroelektronik Mühlhausen's computer systems (e.g. the KC85-series) and also in many self-made computer systems (ex. COMP JU+TER). In Romania could be found another unlicensed clone, named MMN80CPU and produced by Microelectronica, used in home computers like TIM-S, HC, COBRA.