EdSim51DI is an 8051 microcontroller simulator, developed by James Rogers. 2. Check if OpenJDK JRE was properly installed: 3. Download the EdSim51DI simulator from: http://www.edsim51.com/installationInstructions.html 4. UnZip file 5. Give permission to execute the “jar” file as a program. 6. Open the terminal and navigate to the folder and run: And it works!