Prime and Saturn calculators

[dm319]

That's very interesting. For testing the machines (if able to) I reset the registers, so yes it would have been 0. I was going to say that the HP-12c does seem to accept a guess and the HP-12c platinum doesn't, but going back to my HP-12c platinum, it does seem to take a guess also. However, it does get the correct result with 1E-8 unlike the 12c.

The Saturns and Prime seem to return 2.16e-10 - which gives more weight to the Prime operating similarly to the Saturns. I don't think the Saturns take a guess.

However, the HP-12c platinum, even if you can't exactly treat problem 4 as a forensic result, does seem to operate very very similarly to the HP-12c with two extra digits. They are lined up very closely on that heatmap for what that's worth, and certainly closer in behaviour than other calculators imitating the 12c - like the Victor V12 and the HP-12c 'comma' (whether official or not).