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Home > Art, Film & Photography > DOS Extenders: DOS Extender, Pmode, Djgpp, Hx DOS Extender, DOS-4g, Djgcc, Emx, Doswin32
DOS Extenders: DOS Extender, Pmode, Djgpp, Hx DOS Extender, DOS-4g, Djgcc, Emx, Doswin32

DOS Extenders: DOS Extender, Pmode, Djgpp, Hx DOS Extender, DOS-4g, Djgcc, Emx, Doswin32


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About the Book

Chapters: Dos Extender, Pmode, Djgpp, Hx Dos Extender, Dos/4g, Djgcc, Emx, Doswin32. Source: Wikipedia. Pages: 31. Not illustrated. Free updates online. Purchase includes a free trial membership in the publisher's book club where you can select from more than a million books without charge. Excerpt: Developed in the 1980s to cope with the memory limitations of MS-DOS and its derivatives, DOS extenders are programs which enable software to run under the protected mode environment initially introduced with the Intel 80286 processor and later expanded upon with the Intel 80386, even if the host operating system is only capable of operating in real mode. A DOS extender is a program that "extends" DOS so that programs running in protected mode can transparently interface with the underlying MS-DOS API. This was necessary because many of the functions provided by DOS require 16-bit segment and offset addresses pointing to memory locations within the first 640 kilobytes of memory. Protected mode, however, uses an incompatible addressing method where the segment registers (now called selectors) are used to point to an entry in a table which describes the characteristics of the segment. The two methods of addressing are mutually exclusive, with the processor having to make costly switches to real (or V86) mode to service non-protected mode requests. In addition to setting up the environment and loading the actual program to be executed, the DOS extender also provides (amongst other things) a translation layer that maintains buffers allocated below the 1MB real mode memory barrier. These buffers are used to transfer data between the underlying real mode operating system and the protected mode program. Since switching between real/V86 mode and protected mode is a relatively time consuming operation, the extender attempts to minimize the number of switches by duplicating the functionality of many real mode operations within its own pro...More: http: //booksllc.net/?id=159567


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Product Details
  • ISBN-13: 9781157499305
  • Publisher: Books LLC
  • Publisher Imprint: Books LLC
  • Height: 152 mm
  • No of Pages: 32
  • Spine Width: 2 mm
  • Weight: 59 gr
  • ISBN-10: 1157499309
  • Publisher Date: 15 Sep 2010
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Sub Title: DOS Extender, Pmode, Djgpp, Hx DOS Extender, DOS-4g, Djgcc, Emx, Doswin32
  • Width: 229 mm


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