One particular nasty trick was a very tight loop with interrupts disabled writing 0 to a location that was 0xff in the ROM. The ROM and the CPU would end up fighting over this, it effectively shorts 5V through the databus drivers to ground. The goal here is not to damage some peripheral but to directly damage the CPU.<p>On more modern CPUs this trick should not longer work but on quite a few 8 bit micros it definitely did (let&#x27;s not go into how I know this and how I know the ca. 1987 list price of a 6809).