Build Your Own Lunar Lander Computer ...

Talk about "old school"! Here's a link to building your own working replica of the Apollo 11 LEM guidance computer. It took John Pultorak, who is a 54 year old Lockheed Martin software engineer, 4 years to build and program it in his basement. He even documented the construction and posted the plans here. The computer contained a whopping 4k of RAM!