Atanasoff–Berry computer
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The Atanasoff–Berry computer was the first automatic electronic digital computer. Limited by the technology of the day, and execution, the device has remained somewhat obscure. The ABC's priority is debated among historians of computer technology,... Wikipedia
Date introduced: 1937
CPU: More than 300 vacuum tubes @ 60 Hz
Developer: John Vincent Atanasoff with help of graduate student Clifford Berry
Display: Decimal, via a front panel display
Input: Decimal, via standard IBM 80-column punched cards
Mass: 700 pounds (320 kg)
Memory: 3000 bits