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  • 1. 5 MAIN MEMORY EXTERNAL PROGRAM-GENERA- LOGIC STORAGE MINGTIONS ELEMENT DEVICES1ST VACUUM Magnetic core Punched cards MachineGeneration TUBES Language Assembly(1951-1958) Language2nd TRANSISTORS Magnetic core Magnetic tape High-levelGeneration and disks Programming Languages(1959-1963)3rd INTEGRATED MOS (Metal Magnetic tape C ProgrammingGeneration CIRCUIT Oxide and disks Language Semiconductor)(1963-1974)