most modern design for an HP41 rom module?

[MeindertKuipers]

Working hard to get to the first Development board version of TULIP4041, and then on to a module version, as Thomas referred to. As Thomas mentioned, this is not a low power solution, but the settings will all be saved when removed from the calculator. More info will come soon, preliminary details are here: https://github.com/mjakuipers/TULIP-DevBoard