DB48X: HP48-like RPL implementation for DM42

[TomC]

Thank you for the prompt and thoughtful reply.

Certainly, without concern for my personal preference, this EEX functionality has been a fundamental characteristic of all mainstream RPN/RPL HP calculators since 1972..

Regards,
TomC

(08-29-2023 02:52 PM)c3d Wrote:  

(08-29-2023 01:28 PM)TomC Wrote:  A feature of HP calculators I've relied on (since the HP35, HP65, ...HP48) is the fact that I can hit the 'EEX' key without a mantissa and the calculator 'assumes' a mantissa of 1.

The DB48X does not seem to have this feature.

Thank you,
TomC

And it's unlikely it will get it (at least by default). At the moment, my plan is for the EEX function to be a shortcut for a smart conversion function

* For fractions, convert to decimal, i.e. convert 1/4 to 0.25
* For decimal, convert to fraction, i.e. 0.25 to 1/4
* For complex, swap between polar and rectangular format (maybe with an additional cycle through the fraction / decimal format)
* For unit values, e.g. 1.3_km, toggle the two closest SI multipliers, i.e. shift to 1300_m, and 1300_km would toggle to 1.3_Mm

I feel this is a feature I'd use frequently enough that I would like a single-key shortcut, and the fact that it deals with decimal positions or decimal scaling explains why I think it is "mnemonic" to map it to EEX.

That being said, I can certainly make the meaning of that function configurable if you feel like "EEX enters 1E" is important enough.