Cuvee RPN-67 & Complex mode

[Willy R. Kunz]

As the author of RPN-67, let me put my two cents in.

Complex mode was designed as a convenient utility for doing quick evaluations of operations and functions involving complex numbers. It doesn't turn RPN-67 into a complex numbers calculator.

RPN-45, on the other hand, sports a "real" complex mode, complete with 4-level stack and unrestricted register arithmetic. If high-contrast mode is on, you can even see the the full complex result with both real and imaginary parts. To input 2+3i, for example, you would type 2 ENTER 3 I, without losing any stack level (except the complex number in T, of course).