What (who) is legacy systems - definition

OLD COMPUTING TECHNOLOGY OR SYSTEM THAT REMAINS IN USE AND MAY BE OUT OF DATE OR IN NEED OF REPLACEMENT

Legacy systems; Legacy code; Legacy support; Legacy software; Legacy application; Legacy technology; Legacy technologies; Legacy Software; Dangers of unmaintained software; Legacy printing; Legacy computer; Legacy computer system; Legacy Programmer; Legacy programming; Legacy coding; Legacy product; Legacy applications; Legacy hardware; Legacy file format

legacy system

<jargon> A computer system or application program which continues to be used because of the cost of replacing or redesigning it and often despite its poor competitiveness and compatibility with modern equivalents. The implication is that the system is large, monolithic and difficult to modify. If legacy software only runs on antiquated hardware the cost of maintaining this may eventually outweigh the cost of replacing both the software and hardware unless some form of emulation or backward compatibility allows the software to run on new hardware. (1998-08-09)

Legacy 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system is an old method, technology, computer system, or application program, "of, relating to, or being a previous or outdated computer system," yet still in use. Often referencing a system as "legacy" means that it paved the way for the standards that would follow it.

https://en.wikipedia.org/wiki/Legacy_system

legacy software

legacy system

Wikipedia

Legacy 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system is an old method, technology, computer system, or application program, "of, relating to, or being a previous or outdated computer system", yet still in use.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 This can also imply that the system is out of date or in need of replacement.

Legacy code is old computer source code that is no longer supported on the standard hardware and environments, and is a codebase that is in some respect obsolete or supporting something obsolete. Legacy code may be written in programming languages, use frameworks and external libraries, or use architecture and patterns that are no longer considered modern, increasing the mental burden and ramp-up time for software engineers who work on the codebase. Legacy code may have zero or insufficient automated tests, making refactoring dangerous and likely to introduce bugs. Long-lived code is susceptible to software rot, where changes to the runtime environment, or surrounding software or hardware may require maintenance or emulation of some kind to keep working. Legacy code may be present to support legacy hardware, a separate legacy system, or a legacy customer using an old feature or software version.

While the term usually refers to source code, it can also apply to executable code that no longer runs on a later version of a system, or requires a compatibility layer to do so. An example would be a classic Macintosh application which will not run natively on macOS, but runs inside the Classic environment, or a Win16 application running on Windows XP using the Windows on Windows feature in XP.

An example of legacy hardware are legacy ports like PS/2 and VGA ports, and CPUs with older, incompatible instruction sets (with e.g. newer operating systems). Examples in legacy software include legacy file formats like .swf for Adobe Flash or .123 for Lotus 1-2-3, and text files encoded with legacy character encodings like EBCDIC.

https://en.wikipedia.org/wiki/Legacy system

Pronunciation examples for legacy systems

1. migrating from older legacy systems

Social Selling _ Catherine Kaputa _ Talks at Google

2. those old and legacy systems.

Kaizhong Gao _ Talks at Google

3. don't have any legacy systems we have

Lessons in Leadership - How to Be a First Responder in Business _ Jake Wood _ Talks at Google

4. China is not investing in all of the legacy systems

Destined for War - America & China _ Graham Allison _ Talks at Google

5. technology without having any legacy systems in place.

] _ Talks at Google

Examples of use of legacy systems

1. Projects will have the opportunity to reject inventory–based legacy systems that in the past have been imposed on developing nations and carried on the next generation.

2. The poll said one risk the industry faces is unnecessary costs stemming from the need to introduce new technology for some carriers, while sustaining legacy systems for those unable or unwilling to upgrade.

3. It‘s working on gaining FDA approval to market and use DiscAssist in the U.S. (TheMarker) Software house BluePhoenix says it has received a roughly $12 million contract to modernize computer systems for a "large U.K. financial institution". It‘s migrating the old legacy systems to a Microsoft environment and says the project will last about two years. (TheMarker) Teva scored a European victory yesterday after two courts revoked Merck Sharpe & Dohme‘s European patent covering generic Fosamax to treat osteoporosis, a bone–softening condition. (TheMarker) Bookmark to del.icio.us Personalized workout Boutique gyms is the next big thing – for those who can pay.