From UniverseToday : Build Your Own Apollo 11 Landing Computer
Remember the computer on the Apollo 11 Eagle lander that kept reporting “1201″ and “1202″ alarms as Neil Armstrong and Buzz Aldrin approached landing on the Moon?Well, yes, I can. But people under 40 cannot. That's most of the people on the planet...
Well, now you can have one of your very own. Software engineer John Pultorak worked 4 years to build a replica of the Apollo Guidance Computer (AGC), just so he could have one. And then he wrote a complete manual and put it online so that anyone else with similar aspirations wouldn’t have to go through the same painstaking research as he did. The manual is available free, but Pultorak says he spent about $3,000 for the hardware.
The 1,000 page documentation includes detailed descriptions and all schematics of the computer. You can find them all posted on Galaxiki, downloadable in pdf. format (the files are large).
The original Apollo AGC cost over $150,000. It didn’t have a disk drive to store any software, and only 74 kilobytes of memory that had been literally hard-wired, and all of 4 Kb of something that is sort of like RAM.
It was developed by the MIT Instrumentation Laboratory and it a pretty http://www.blogger.com/img/blank.gifahttp://www.blogger.com/img/blank.gifmazing piece of hardware in the 1960s, as it was the first computer to use integrated circuits. The AGC mutlitasking operating system was called the EXEC, it was capable of executing up to 8 jobs at a time. The user interface unit was called the DSKY (display/keyboard, pronounced “disky”); an array of numerals and a calculator-style keyboard used by the astronauts to communicate with the computer.
Each Apollo mission featured two AGC computers – one in the Apollo Command Module and one in the Apollo Lunar Module.
And to feed your inner Space Administrator Geek... there's Race Into Space, a freeware port for Windows of BARIS - "Buzz Aldrin's Race Into Space" (1993), itself a port of the Dead-Tree Game "Liftoff" (1989).
Looking at the specs... you could port this onto most mobile phones today.
12 MHz processor
32Mb for the videos
320 x 200 pixel resolution
That's about 500 times as powerful as the actual computers used in the Apollo spacecraft, 24 years earlier.