RPN83P: RPN calculator for TI-83+ TI-84+ inspired by HP-42S

[bxparks]

(11-20-2023 11:31 PM)dm319 Wrote:  You've made me want a TI calculator. Could be a reasonable option for those who want RPN but not the price of HPs.

How does roll and x-y work?

Yeah, these TI-83+ and TI-84+ are dirty cheap on eBay. I recommend the 84+, it has the better LCD screen. I have now implemented enough of the HP-16C (which I don't have), that I find myself preferring to use my app to do hexadecimal, bitwise, and logical calculations.

I follow the HP-30b conventions with regards to roll and x<->y:

• Left paren ( is roll
• Right paren ) is x<->y
  

I think this is the convention used by other HP calculators with dual ALG and RPN modes, like the HP-17BII.