Cuvee RPN-67 & Complex mode

[Willy R. Kunz]

(10-19-2022 04:37 PM)Nigel (UK) Wrote:  Thank you for this perspective. As well as RPN-67 I also own RPN-45, 70, and 97 so I'm certainly a fan of your work! To be honest I'd never looked at the RPN-67 complex mode before reading Matt's post about it; I was a little surprised at what it was like, given how complex mode is implemented in RPN-45, but that's fine. There's nothing wrong with being different. All of these calculators look great and work brilliantly!

Incidentally, the following key sequence allows the calculation of (1+2i) x (3+4i) on RPN-67 entirely within complex mode:

• Make sure complex mode is active;
• Press 2 x<>y 1 ENTER 4 x<>y CLx 3 x.
  

This leaves -5 in X and 10 in Y, as it should. The CLx disables stack lift and allows the 3 to be entered without changing Z and T.

Nigel (UK)

Correct. I was just going to suggest this method, when I noticed your post.

Incidentally, the next version will have a new Extra Function (number 16) called Toggle CPLX Mode. It will simply turn complex mode on or off.
So you store 16 in the FN register, then execute g OP EXEC FN to toggle complex mode. The stack remains unaffected.
For convenience, you may even add a 3-step program:

Code:

LBL C
OP EXEC FN
RTN

which allows you to turn complex mode on and off by simply pressing C.