iPad RPN calculator

[Peter Klein]

I just got an iPad, and I'm looking for an RPN calculator app for it. I already downloaded free42, but this only appears to work in the portrait mode, and I mostly keep the iPad in landscape mode. Any suggestions? At the Apple store, PCalc and an enhanced HP 11 C simulator look promising but are not free, so I can't try before I buy. I'd appreciate a little advice from the collective wisdom here before I spend.

Thanks!
--Peter