Experiment 1 Programmable Parallel Data transfer interface (8255) 1 Objective 1.1 Learn how to set 8255 work in Mode 0 and set A as output, B as input. 1.2 Learn how to connect 8255 with other devices 2 Contents Figure 1 2.1 Connect the circuit of experiment as shown in Figure 1, the Port B of 8255 is connected with switch KO-K7, Port A is connected with LED. Chips needed for this experiments are 8086, 8255, 74LS08, 74LS138, 74LS245, 74LS373, SWITCH, CHIPRES18R, SEG-COM-CATHODE 2.2 Write a program to input the data through the Port B of 8255 and output them from Port A, the flowchart is shown as Figure 2 2.3 Debug and compile the program and load it into the 8086 chip 2.4 Run the program and turn on or turn off the switch to see the status of the LED