⊿ Point. {R} Glossary. ◢ Keyword: L. ▰ Sources. 〓 Books [B] ◥ University. {q} PhD. ⏫ THEMES. ⏫ Big Data. [B] Big Data. ⚫ USA. ↂ EndNote. ☝️ BD Dummies. Legacy System. As of 2011[update], MS-DOS is still used in some enterprises to run legacy applications, such as this US Navy food service management system. In computing, a legacy system is an old method, technology, computer system, or application program, "of, relating to, or being a previous or outdated computer system,"[1] yet still in use.
Often referencing a system as "legacy" means that it paved the way for the standards that would follow it. This can also imply that the system is out of date or in need of replacement. Overview[edit] The first use of the term "legacy" to describe computer systems probably occurred in the 1970s. [citation needed] By the 1980s it was commonly used to refer to existing computer systems to distinguish them from the design and implementation of new systems. While this term may indicate that some engineers may feel that a system is out of date, a legacy system can continue to be used for a variety of reasons.
Problems posed by legacy computing[edit] NASA example[edit]