> I suspect one of the reasons Apollo computers were all built with just one type of logical chip is the ability to replace faulty parts The Apollo Guidance Co

> I suspect one of the reasons Apollo computers were all built with just one type of logical chip is the ability to replace faulty parts The Apollo Guidance Computer was built with two types of chips: a 3-input NOR gate and a core memory sense amplifier. The reason to use just one logic chip was because ICs were very new at the time and there was very little reliability information. By standardizing on a small number of components, they could procure enough to determine and maintain quality. (See Journey to the Moon chapter 12.)