DESIGN AND FABRICATION OF GENERAL PURPOSE 8085 CARD AND DEVELOP VARIOUS INTERFACING CARDS USEFUL IN EDUCATION OF ELECTRONICS.

At present in colleges, the universities and other technical institutions the microprocessor as a subject is inevitably taught. A large section of student learners and hobbyists wish to gain in depth knowledge in the field of microprocessor. We have considered a very versatile Intel microprocessor 8085 for the present work. The designing of the basic microprocessor CPU card is conceived and developed. The complete hardware and related software have been developed. This has culminated into a basic trainer kit. The interfacing aspects of buffer chips, memory chips, I/O chips along with keyboard and display devices have been presented in detail. The P.C.B. designing was also carried out using in-house facility. The detailed assembly language program for this system called monitor program is indigenously developed and successfully run on the system. The monitor program supports all basic features of a typical microprocessor trainer kit. In this kit the commands like Exam memory, Block move, Go and Execute, Single step, Exam register, Next and Previous are included. We have used 8085A, 8279, 8255, 74373, 74245, 74155, 74138, FNDs, push button switches and few discrete components in the present kit. The system resources can be used for interfacing other circuits by using kit expansion connectors. The present work gives a complete idea of developing 8085 based basic system. To create various applied types of interfacing gadgets, we have presented a number of interfacing modules. In these, the interfacing design circuits and related softwares have been discussed. This would very helpful to learners to develop their own interfacing modules based on 8085. Following is the list of the interfacing modules developed by us.  Digital-to-analog converter  Analog-to-digital converter  Running character display  An intelligent control panel  Analog voltage measurement without using ADC  Logic controller  Interfacing Timer 8253  Interfacing USART 8251  Interfacing PIC 8259 Thus the present work would be very useful to the learners because it represents every hardware detail with the complete radiate software.