The IBM Type-III Library was software provided by IBM to its customers, available without charge, liability, or support, and typically (perhaps always) in source-code format. Well-known examples are for mainframe software; IBM may have also used this same classification on smaller systems. IBM also distributed other systems in source code form. Most early operating systems were shipped in this way.

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  • The IBM Type-III Library was software provided by IBM to its customers, available without charge, liability, or support, and typically (perhaps always) in source-code format. Well-known examples are for mainframe software; IBM may have also used this same classification on smaller systems. IBM also distributed other systems in source code form. Most early operating systems were shipped in this way. Source distribution of the VM family of operating systems continued for several decades after it supplanted CP/CMS from the Type-III Library, and TPF was always distributed in source form, apparently continued today with z/TPF. Unlike Type-III software, such systems were supported by IBM.
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  • The IBM Type-III Library was software provided by IBM to its customers, available without charge, liability, or support, and typically (perhaps always) in source-code format. Well-known examples are for mainframe software; IBM may have also used this same classification on smaller systems. IBM also distributed other systems in source code form. Most early operating systems were shipped in this way.
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  • IBM Type-III Library
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