Great post - thanks Gary.
After the SaturnV IU had completed its job, the Apollo Guidance Computer (AGC) that you mention took over the inertial guidance duties, it also has a fascinating development story. It interfaced with a gyroscopic Inertial Measurement Unit, the AGC included hardware utilising a series of newly invented I.C's (with an unbelievable six transistors on each IC!), non-erasable 'software' (which was actually hardware) installed from 'woven' çore-rope memory & a cumbersome but robust looking new development - a display/keyboard unit. All these components brought together from Doc Draper. Fascinating reading in the link below:
https://wehackthemoon.com/tech/apoll...g-breakthrough