With regard to the previous post, I modified the program in each of the machines to eliminate the display of intermediate results. In that instance, the performance changes radically. The HP-75C comes in first, displaying the result in about 1s. The TI-74 is second at about 2s, while the HP-71b comes in a distant third at about 5s, which is still radically quicker.

I was surprised a bit to see the HP-75C overtake the TI-74, given the original performance.