A hardware interface connecting a TP-801 single card microcomputer with a µ80 general purpose printer and the associated program were introduced. The development capability of the single card microcomputer has been enhanced and the EPROM programming and text printing and saving have been made much easier. The circuit of the interface is simple

easy to use and suitable for common use. The interface can also be used to connect other types of Z-80 single card microcomputers with other types of line-printers with a parallel interface.