Geoff, that was a great talk! I watched it on YouTube three times through before noticing you were on this forum.
With fancy new features and memory in the DM42, would it be possible to aggregate some of the programs you had on different individual calculators onto the DM42? I assume that some of your programs, and particularly the database of airport codes and lat./longs. pushed each old calculator to its limit, but maybe that wouldn't be the case for a newer calculator with a ton of memory and CPU power.