Pick operating system

business data processing operating system released in 1965

en-US/ˈpɪk ˈɑpɚˌeɪtɪŋ ˈsɪstəm/
en-GB/ˈpɪk ˈɒpəɹeɪtɪŋ ˈsɪstəm/

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operating system