Terminate and Stay Resident (TSR) software remains in the memory of the computer, even if he no longer runs. This was a common type of computer software in the days of Microsoft DOS operating systems. to exist in view of the introduction of Windows, these programs virtually ceased. But learning about it improves our understanding of how operating systems work. They also help improve the user interface. And last but not least, they made millions of dollars for a successfulDevelopers.
In the days of DOS operating system, usually a single program running at a time. This could be quite frustrating to wait for users would have a favorite program to work, even if the computer system was not really something to do. Terminate and Stay Resident software solved this problem, if not always the best way. Users were satisfied when the sputtering system. Let's see how it all works.
When an application program running under DOS wouldto stop, it would be so informed DOS COMMAND.COM program's control. This program frees the application program memory and other system resources. Access to these resources again meant reloading the program from the hard disk. Users were unhappy waiting for the program to load. Finally, she bought a computer to get things done quickly.
Clever programmers used a somewhat obscure DOS utility, so that a program could be remembered, even if it is terminated. The good news was thatUsers would not have to wait to charge for the program. The bad news ... These tricks result in various problems.
For starters, would most DOS viruses use this functionality to their devastating damage. Another problem was interference between the operating system and the TSR. For example, reactivate Sidekick, probably the most famous and most of them sold down the users of the two Shift keys simultaneously. Sidekick monitors the keyboard and trying to seeif the user wanted to reactivate. But keyboard surveillance is a DOS function. So sooner or later, DOS and Sidekick would bump heads. When TSR was more and more popular, more and more programs came heads with each other and with DOS. In addition, each program requires its own memory. You may recall that computer memory has been sorely missed on the old DOS computer, even with crutches. At some point, no longer makes sense for homeowners to add their additionsHome new arrivals. Finally, it makes more sense to demolish the old structure and build a new one from scratch. Let me end with a real story.
I remember like yesterday the last time I've sidekick, my favorite and almost only Terminate and Stay Resident program. I called my technician if my computer misbehaved. His first question: "What TSRs are you using?" I replied: "Only Sidekick." His answer: "It's your problem, get rid of it." I have and started my computerreturn to work. Then, like millions of others, I went to Windows. Another operating system, the other problems thought. But for me and for so many others, were Terminate and Stay Resident programs forever ended.
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