Somewhere in the code running inside our big HP household printer (and, I
suspect, every other printer on the planet) there’s a line of code, something
along the lines of
if (drum_age > drum_warning_level)
Well, that warning message comes up awful early. And it dawns on me that the value chosen for
drum_warning_level has an impact on HP’s cash
flow that’s measured in billions: smaller value, more money.
And the temptation to move it down and then down again over the years, that’d