legacy system

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Related to Legacy support: Legacy systems

legacy system

[′leg·ə·sē ‚sis·təm]
(computer science)
A computer system that has been in operation for a long time, and whose functions are too essential to be disrupted by upgrading or integration with another system.

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.

legacy system

An older computer system such as a mainframe or minicomputer. It may also refer to only the software (see legacy application).
References in periodicals archive ?
As networks transition to IPv6, legacy support for IPv4 is imperative.
With REDCOM, you have the flexibility to incrementally migrate to VoIP in a cost-effective manner when it makes sense for your business, with complete legacy support and maximum flexibility of deployment.
The SBC offers 2eSST and 2eVME functionality, and VME and PCI legacy support via a Tundra Tsil48 bridge that handles simultaneous transactions and FIFOs to prevent PCI/X-to-VME deadlock.
0, together with legacy support for older protocols.
The ability to support both SSL and IPsec VPN tunnels enables the ProSafe Dual WAN Gigabit SSL VPN Firewall to provide both clientless remote access through a secure Web browser interface and legacy support for client-based remote access.
In aftermarket services and systems, the engine repair, legacy support and landing gear businesses were all performing well, BBA said.
The single interface would also retire 13 legacy support systems.
The company will also soon release a web-services interface for modern loan origination and policy administration systems, while at the same time continuing its legacy support for print-stream based integration.
In some instances, strong legacy support will be critical.
However, the backward legacy support of PCI Express allows system developers to migrate to these new features at their desired pace.
MPC has invested significant R&D resources to develop a notebook that combines both new mobile technology and legacy support," said Paul Petersen, MPC's vice president of product marketing and development.
This broad platform selection addresses the need for legacy support, and is especially valuable where Information Technology departments have limited control over their users' choice of platforms.