Summation based benchmark for calculators

[Marc van Lemmen]

My HP9821A has a total of 423 registers ( Option 001 installed, a HP9820 with option 001 has 435 registers according to the manual !). One register is 4 words ( manual ), so that is 3384 bytes. There is also some internal memory, at least 256 words, so the total should be around 4Kb.
I think a HP9820/9821 without option 001 installed has about 2Kb of ram.

By the way, the HP9821A is not RPN but algebraic. Programming method is pre HPL.

My HP9100B is not working fine, he works intermittend. And there is no power or cube-root function, I am working on it but it will take some time. I have a workaround, but less steps, so that would be difficult to compare.