By the way as a side point: trapping on a data access is called a "watchpoint", while "breakpoint" is when the program counter reaches a certain value. cf anot

By the way as a side point: trapping on a data access is called a "watchpoint", while "breakpoint" is when the program counter reaches a certain value. cf another topic on the front page today: this can be done with hardware (as the author did) or (extremely slowly) in software when you don't have hardware support for it. Not that this comment addresses the author's unhappiness.