It provided extended support for user-defined functions, external sequential disk files, and linking with assembler language modules for device support and operating system interfaces.
ɪt pɹəvˈaɪdᵻd ɛkstˈɛndᵻd səpˈoːɹt fɔːɹ jˈuːzɚdᵻfˈaɪnd fˈʌŋkʃənz, ɛkstˈɜːnəl siːkwˈɛnʃəl dˈɪsk fˈaɪlz, ænd lˈɪŋkɪŋ wɪð ɐsˈɛmblɚ lˈæŋɡwɪdʒ mˈɑːdʒuːlz fɔːɹ dɪvˈaɪs səpˈoːɹt ænd ˈɑːpɚɹˌeɪɾɪŋ sˈɪstəm ˈɪntɚfˌeɪsᵻz.