Besides its speed, the most remarkable thing about ENIAC was its size and complexity. ENIAC contained 17,468 vacuum tubes, 7,200 crystal diodes, 1,500 relays, 70,000 resistors, 10,000capacitors and around 5 million hand-soldered joints. It weighed more than 30 short tons (27 t), was roughly 8 by 3 by 100 feet (2.4 m × 0.9 m × 30 m), took up 1800 square feet (167 m2), and consumed 150 kW of power[11][12](leading to the rumor that when ever the computer was switched on, lights in Philadelphia dimmed).[13] Input was possible from an IBM card reader, and an IBMcard punch was used for output. These cards could be used to produce printed output offline using an IBM accounting machine, such as the IBM 405.
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