Try using an HP calculator emulator. I suggest the HP48, 49, or 50G if you can find linux emulators. I personally use the 48 and 50G, and I am waiting for a HP Prime.
What hp48 emulator are you using, I checked recently and only found a couple really old ones that neither I could get working.
I don't. I use my real 50G, and 48G if I need it in a pinch. I find having a single device helpful just for calculations instead of using a computer.
And RPN isn't hard to learn, take 4 + 5, in RPN that is
4
5
+
That's it, you enter in the letters into a vertical stack, and then the operator that would run between them. This is useful for functions like sin, cos, tan, and other functions that in a normal calculator you would need to use parentheses with, in RPN you can use these keypresses for the cos of 72
7
2
cos
=-967250588274
where in a Ti type algebraic environment you need to do
cos
7
2
)
enter(equals)
This is just a net improvement of one keystroke in RPN, but the stack can be very useful as I find it helps me jot down number I need later that I can just access later.
And with the 49G and onwards, it has CAS functionality allowing for you to put entire algebraic expressions in for it to solve. It also has neat features like an equation writer (Better on the 48G, never used the HP Prime version) for textbook style entry, and a famous programming interface allowing for RPL, and I think ASM coding.
And if push comes to shove, you can use the ' button to enter in regular algebraic expressions (No implied multiplication for some reason, so you would need to do 3*X instead of just 3X, only in regular Ti style entry, not textbook entry) or you can change it to a Ti similar mode where all expressions entered are Algebraic (Only on 49G and up I think).
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