HP-17BII+ serial

[Don Shepherd]

My advice today is the same as it was 8 years ago (in that thread you quoted): unless you want to be really, really frustrated and confused, get a 17b or 17bii. The solver on those machines works as a programmer would assume it would. There are at least two equations in the Applications Manual that work fine on the 17b/17bii, but won't work on the 17bii+ without some modifications. Cyrille has said in the past that the solvers are not exactly the same; Kinpo added an extra evaluation pass that causes unexpected and unwanted behavior, such as you experienced with your equation.

The 17b and bii are marvelous machines, and I continue to use them daily.