What's your favorite non-RPN HP?

[Thomas Radtke]

My first HP was the 20S, which was an amazing experience after the not-so-bad fx-81p. Still, without indirect addressing and the various functions that load into memory it has some strange missings/features. Interesting yes, but not a favourite.

The 27S was what I took with me when getting my treatment and doing hospital/home office. Of course, the programming model is even more crippled, but actually being an equation solver there's a lot one can do with e.g. sigma and L. You all know that, of course. It has a quite large memory and does what I need: Solve some equations, store a few numbers. Yes, the 27S might be my favourite non-RPN calculator.