An older style adapter card that does not support Plug & Play. It may have to be configured using a software configuration program or by physically arranging jumpers on the board.

The ability to support older and almost outdated equipment.

A term used to describe "older" computer technology.  When specifically addressing PC hardware, this term is used to refer to hardware developed prior to the Plug and Play standard.

Data or programs housed in an older computer system. This is usually seen in the context either of needing to interface an older system to newer internet based programs, or in a discussion of moving the information from an old system into its replacement.

Something Old ; typically used when referring to versions of software that are outdated, no longer supported, or antiquated

Old computers or software that you cannot or do not want to get rid of.

Any feature in the computer system based on older technology for which compatibility continues to be maintained in other system components. In the context of Windows 98, a non–Plug and Play feature.

Old hardware that new systems must accommodate because of backwards compatibility. LFN (Long File names) The ability of windows 9x to store files with names as long as 255 characters using VFAT.

A word often bandied about by information technology consultants, "legacy" refers to an application or information system into which a company has invested a lot of time and money. For many companies to install fancy new software and hardware, it must be able to marry up to its legacy system. Legacy systems are typically viewed as an unfortunate but unavoidable impediment to large-scale upgrades.

A computer, system, or software that was created for a specific purpose, but is now outdated. Anything left over from a previous version of the hardware or software.

Term used to describe enterprise applications or systems installed in the distant past, but still being used. Typically, they are characterized by outdated technologies, but are still critical to day-to-day operations. Replacing legacy applications and systems with systems based on new and different technologies is one of the IS professional's most significant challenges. As enterprises upgrade or change their technologies, they must ensure compatibility with old systems and data formats that are still in use.