Plus42 Equations, Preview Release

[Steve Simpkin]

Hi Thomas. I believe I may have found a subtle difference in the operation of the solver between the HP-27S and Plus42. When working through the temperature conversion example on pages 94-95 of the HP-27S Owner's Manual, I see a slightly different operation in the way the variable keys work on Plus42. After using the F/C equation to convert 350 F to 176.667 C, the example has you press EXIT then {down arrow} to choose the K/C equation and press CALC to solve the new equation (see attached picture). The example then has you press the "K" variable key. In the HP-27S example, pressing the variable "K" key immediately solves for K using the current value in variable "C" (176.6667). On the Plus42, pressing the "K" variable key assigns the number in the X register to "K" instead of solving for "K". I have to admit that I see advantages in either operation method but they are different from each other.