HardwareSimulator Calculator icon not becoming active
I have downloaded software from software page where it says "Download the Nand2tetris Software Suite Version 2.6 (about 730K)"
However, when I run downloaded Hardware Simulator it says "2.5" in the title and whatever I do after loading sample HDL files and changing input pin value the calculator icon never becomes active and does not calculate anything!
Re: HardwareSimulator Calculator icon not becoming active
Using the .hdl file you provided, the Hardware Simulator performs as described in the tutorial on my system.
After starting the app and loading the Xor.hdl file, I changed the "a" input from 0 to 1. The Output pins and Internal pins were "grayed" and the Eval button was immediately enabled. Clicking the enabled button changed the output as expected and the Eval button was disabled.
I am running the sim on Windows 10. I loaded the simulation files over a year ago, but I believe this is the same version you are running. My java environment is very old.
Also, the test script supplied for the project completes without error using this HDL file. I'm afraid this is not much help, but it's apparently not related to the HDL file.