This is a pre-recording of the FOSDEM 2024 talk about DB48X, a modern reimplementation of HP RPL (Reverse Polish Lisp) for SwissMicros DM32 and DM42 calculators.
https://fosdem.org/2024/schedule/event/fosdem-2024-1990-how-much-math-can-you-fit-in-700k-/
https://48calc.org