Terminate and Stay Resident - Decline

Decline

With the development of games using DOS extenders (a notable early example was Doom) which bypassed the 640 KB barrier, many of the issues relating to TSRs disappeared, and with the widespread adoption of Microsoft Windows and especially Windows 95 (followed by Windows 98) — which rendered most TSRs unnecessary and some TSRs incompatible — the TSR faded into the obsolescence, though Win16 applications could do TSR-like tricks such as patching the IDT because real-mode Windows allowed it. The TSR has now almost disappeared completely, as multitasking operating systems such as Windows Vista, Windows 7, Mac OS X, and Linux provide the facilities for multiple programs and device drivers to run simultaneously without the need for special programming tricks, and the modern notion of protected memory makes the kernel and its modules exclusively responsible for modifying an interrupt table.