Designing ISA card with easy interface

one of the most important industrial computers' bus is Industry Standard Architecture (ISA) gap. At lost ISA could communicate with 8 bits data but nowadays it can communicate with much data bits. Only 8 bits has been used in this article, because the data are in one-byte formats. With ISA gap of the computer an interface circuit could be designed between computer and systems such as temperature control system. For this work, first an address is given to the system, and then circuit communicates with that system by means of an address and a data decoder. In this paper a system has been designed that can be used in every industrial work, because it has enough input and output (I/O) pins for most of systems. After introducing ISA slot main design has been presented. This circuit can be used in each kind of industrial work that interfaces with computer, DC, AC and Stepper motor controls and serial interface with computer.