Considering 35s acquisition

[Thomas Klemm]

Check the HP-35s bug list. Probably not an issue considering your usage. But what botheres me is missing consistency:

• complex numbers are supported but you can't calculate the square root
• there's a 2*2 and 3*3 linear solver but it can't be used in a program
• missing decomposition of complex numbers or vectors
  

Coming from the HP-15C this might disappoint you.
But the solver is useful and you probably never have to worry about memory.
There's an emulator for windows you might want to try beforehand.

Quote:dedicated to engineer work including unit conversions and also integer base conversions

You might find this program useful: Base Conversion for HP-11C

Cheers
Thomas