The 128 bit arithmetic part is really interesting. I wonder whether they used libquadmath and whether they needed to implement any extra funcitons beyond what’s available there.
My favorite thing on the TI SR-50 was to calculate 69! ... It was the largest number that the 2-digit exponent could hold and also the slowest calculation. I also discovered the 1 hidden digit of precision (13 digits) by subtracting know digits of pi away from the pi constant to reveal the invisible digit in scientific notation ...
