BCD calculators

[Paul Dale]

The conversion between DPD and BCD isn't trivial. It's actually surprisingly subtle: DPD requires a 1k entry lookup table to convert to BCD and back.

This was something I raised with the author of the decNumber library (Mike Cowlishaw) many years ago. The response was along the lines of "sure, leave out that table but you won't be binary compatible". For the 34S, binary compatibility wasn't important so we left it out and saved many precious bytes of flash.


Pauli