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First-Generation Computers (c. 1946–1959) 
 
Core Components: Vacuum tubes were used for the central processing unit (CPU) and memory. 
 
Memory: Magnetic drums were used for memory storage. 
 
Size and Power: They were very large, occupying entire rooms, consumed vast amounts of electricity, and generated a lot of heat. 
 
Speed: They were slow and unreliable, with components frequently failing. 
 
Programming: Programming was done using machine language, which is very basic and difficult to work with. 
 
Input/Output: They used input devices like punched cards. 
 
Second-Generation Computers (c. 1959–1965) 
 
Core Components: Transistors replaced vacuum tubes, making the machines smaller and more reliable. 
 
Memory: Magnetic core technology was used for memory. 
 
Size and Power: They were significantly smaller, generated less heat, and consumed less power compared to first-generation models. 
 
Speed: Computers were about ten times faster than their predecessors. 
 
Programming: They could use assembly language and high-level programming languages such as FORTRAN and COBOL, making them easier to program. 
 
Input/Output: Magnetic tapes were used for input and output. 

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