1 I once was deep into diagnosing a wierd software problem in a humongous Fortran program written all in double precision integer. I reduced it to a simple test program: I=1 J=-1 K=I*J Print K and K kept coming out -2 After pounding on all the fixed point diagnostics, calls to DEC, I finally realized that although the program was all integer, the run-time multiply routine used the floating point processor to do double precision integer math, and the FPP was bad. A replacement of a board of the FPP fixed it. With all the number crunching we were doing, the problem only appeared when you tried to fill your bottle with oil from the east end of twopit room (to oil the rusty hinges of the treasure chamber,) but no matter what you did, you got a bottle filled with water instead of oil.