[Star Traveler]

I believe the HP calculators, which are “old hat” now — are more powerful than all the computing power available for the Apollo manned space program, spacecraft and mission going to the moon — and a WHOLE HECK OF A LOT CHEAPER too ... :-) ...

That’s the way technology goes ...

[2111USMC]

You've got that right. I've seen one of the Apollo space capsules up close in Houston. The first thing that struck me was how small it was (I got claustrophobic just looking at it). The next thing I noticed is that every control and instrument was electromechanical. There may not have even been a printed circuit board in the thing.

Back then the missions were planned and executed by raw human brain power and slide-rules.