Explore the world of debug interfaces and hardware hacking in this Black Hat conference talk. Learn about the challenges of discovering debug interfaces, traditional methods, and the inspiration behind the JTAGulator. Delve into external and internal interfaces, PCB layout heuristics, and security through obscurity. Examine the hardware design requirements and overview of the JTAGulator, including its board layout, subsystems, and key components such as RAM, Propeller Tool, and USB interface. Understand the importance of adjustable target voltage, level translation, and input protection in hardware hacking. Gain insights into firmware development for hardware security tools.