jcgriff2 Administrator, General Manager, BSOD Kernel Dump Expert, Microsoft MVP Staff member Joined Feb 19, 2012 Posts 19,591 Location New Jersey Shore Jul 20, 2019 #1 I was very young when America landed on the moon in July 1969. I remember vividly watching it on TV while our family was on vacation. What fascinates me are the two computers the Orbiter and Lunar Landing Module vehicles used. Two identical computers served Apollo 11 measuring 24 inches by 12.5 inches by 6 inches, weighing 70.1 pounds, and requiring 70 watts at 28 volts DC. Apollo 11's two systems each had 1 MHz clock speed, four 16-bit registers, 4K RAM (some report only 2k RAM), and 32K ROM. The coding (likely written in Assembler (??)) was done by MIT. Apollo 11's Lunar Landing Craft gave off constant "1202" error codes as the vehicle neared the lunar surface/ landing site, translated simply as "the computer is overloaded" forcing the astronauts to fly the vehicle manually. The Apollo 11 computers were used for "guidance, navigation, and control" - whatever all that encompasses is unknown. I honestly do not know what, if anything, the average person today could do with a system with such specs (not very much, I suppose!).