Memory Management Essay -- Essays Papers

Memory ManagementA computer open(a) of running a multi-tasking system may have to deal with wide varying demands for memory. At some times, no users may be logged on and the only tasks running are the kernel and possibly a mount process. At other times, ten or more users may completely be carrying out complex operations which demand lots of memory.Microsoft Windows versions 3.x provided a protected mode graphical operating environment that ran existing MS- state of matter applications and eitherowed Windows applications to depart the 640K barrier. There are three types of memory that Windows 3.x can use or provide (conventional, extended, and expanded). Conventional memory is the first 640K of memory in your machine. MS- DOS has a limit of 1024K of addressable memory (conventional memory plus the UMA), and all MS-DOS applications must run within this conventional memory. All Windows 3.x operating modes per centum this point of accumulation for running MS-DOS applications, but standard and 386 enhanced modes break the 640K limitation for running Windows applications. Windows 3.x enhanced mode can create multiple virtual(prenominal) MS- DOS machines (Memory).Between the top of conventional memory at 640K and the leave of extended memory at 1024K lies the 384K UMA. This area does not contain somatogenetic memory. Mapped into the 384K UMA are the system BIOS (basic input/output system) ROM chips and the break adapter memory. When you install other accessory cards, such as net income adapters, they may also occupy sp...