Top three calculators ?

[rprosperi]

(04-05-2018 06:30 PM)Harald Wrote:  Would a Forth ROM give me a proper RPN calculator?

Not really, out of the box, though you could write one in Forth; there are certainly a few examples in old issues of the PPC Journal, PPC Computer Journal, CHHU, the Paris chapter newsletter (if you read French), etc. but a better answer is the RPN BIN program by Chris Capaner, available in several of the archives in the OLDP, if you're familiar with that (e.g. on LIF volume HORN\LEX01). Note there is also an RPN LEX file, that is (IMHO) not nearly as good, though an advantage of the LEX version is source code is also floating around so you could tailor it to your tastes if so inclined (note the source is Saturn assembler, not Forth).

If you're not, and you have a PIL-Box, I can send you a .LIF file and a copy of the overlay. The overlay is not necessary for basic operators (they are where they are) but likely needed for most other functions, depending on your memory).