The debugger can be downloaded from [here](https://docs.oracle.com/en/java/javacard/3.1/guide/installing-development-kit-simulator.html) and [here](https://www.oracle.com/java/technologies/javacard-downloads.html#sdk-sim) The architecture is described [here](https://docs.oracle.com/en/java/javacard/3.1/guide/debugger-architecture.html) The debugger usage from IntelliJ IDEA is described [here](https://youtu.be/Q-3rQsU3XGk?t=2632) 
