Mini EPROMmer - the simple programming circuit

straightforward. The EPROM 2716 contains 11 inputs (address lines AO ... A10) and 8 data lines (DO ... D7), which are connec- ted as inputs during programming and as outputs for other functions. There- fore it is possible to program complex logic functions. For example a programmed EPROM can be used as code converter. This leaves us with the problem of finding a suitable program- ming device. It is rather expensive to build or buy a programmer, if it is only to be used occasionally. In this case a straightforward circuit will suffice, with which the associated data of the logic functions can be stored in the EPROM quite easily. The circuit described in this article offers this possibility. Any program can be programmed step by step with the aid of this circuit. There is one crucial point which has to be considered, when using EPROMs and that is the access time. The oper- ation speed of the complete circuit depends on it. The circuit must be constructed in the conventional manner, using