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The main drawback of first-generation computers like the ENIAC was their size and power consumption; they were enormous, occupying entire rooms and requiring significant electrical power. Additionally, they used vacuum tubes, which were prone to failure and generated a lot of heat, leading to reliability issues. Programming them was complex and time-consuming, often requiring manual rewiring and a deep understanding of the hardware. Lastly, they were limited in their capabilities, primarily designed for specific calculations rather than general-purpose computing.

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