Now we’re getting somewhere a greater than 7 hour player/recorder at 0.1 second sample resolution.
There is more physical EEPROM that I’m using yet also, so I think I can sample much faster.

I was surprised that at 20MHz, DT’s Elapsed time (real timer overflow interrupt) and I2C read/write works fine together.
I have a flag watching for I2C error, and it’s not displaying unless I sabotage the hardware.