Blitter kills

The Amiga was an absolutely marvellous  machine. It had so fantastic special hardware for that time. It was incredible. Two of them where Copper and Blitter. A funny trick to hinder the debugger was to set up the Copper to tell Blitter to fill the memory of your running program with 0x00 the next time the cathode ray reaches a specific position. Your program regularly stopped the Copper from doing this. But if you stopped the CPU with a debugger, Copper and Blitter continue there work and killed your programm or other important things.