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DOS Extender
A DOS extender is a computer software program running under DOS that enables software to run in a protected mode environment even though the host operating system is only capable of operating in real mode. DOS extenders were initially developed in the 1980s following the introduction of the Intel 80286 processor (and later expanded upon with the Intel 80386), to cope with the memory limitations of DOS. DOS extender operation A DOS extender is a program that "extends" DOS so that programs running in protected mode can transparently interface with the underlying 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 Conventional memory, 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 the Global Descriptor Table which describes the characteristics of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DOS4GW
DOS/4G is a 32-bit DOS extender developed by Rational Systems (later Tenberry Software). It allows DOS programs to eliminate the 640 KB conventional memory limit by addressing up to 64 MB of extended memory on Intel 80386 and above machines. Features Functioning as a highly flexible and reusable memory extension library, DOS/4G allowed programmers to access extended memory without writing specialized code. It embeds itself in the executable file at linking time and executes before main application code, so usually DOS/4G initialization messages show up at launch. It can in principle operate within MS-DOS, PC DOS, DR-DOS and other DOS clones, the DOS boxes of OS/2, Microsoft Windows, Windows NT and Windows 95, and DOS emulators such as DOSBox. However, in practice few DOS/4G games or other applications will run on non-DOS-based versions of Windows, including Windows NT, Windows 2000 and Windows XP, since none of these allow direct access to the hardware as was used for disp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Watcom
Watcom International Corporation was a software company, which was founded in 1981 by Wes Graham and Ian McPhee. Founding staff (Fred Crigger, Jack Schueler and McPhee) were formerly members of Professor Graham's Computer Systems Group at the University of Waterloo, in Waterloo, Ontario, Canada. Watcom produced a variety of tools, including the well-known Watcom C/C++ compiler introduced in 1988. The first company started by Graham and McPhee was Structured Computing Systems, incorporated in 1974. Then the software development company, WATCOM Systems Inc, started in 1981 with three full-time employees, but had been incorporated two years earlier as Waterloo Basic Enterprises Limited. In 1984, the various subsidiary companies of The WATCOM Group software organization—marketing and sales, publications, seminars and systems (software development) -- were all renamed as WATCOM companies for consistent branding. These were later all merged into one full-service software company, W ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Assembly Language
In computer programming, assembly language (or assembler language, or symbolic machine code), often referred to simply as Assembly and commonly abbreviated as ASM or asm, is any low-level programming language with a very strong correspondence between the instructions in the language and the architecture's machine code instructions. Assembly language usually has one statement per machine instruction (1:1), but constants, comments, assembler directives, symbolic labels of, e.g., memory locations, registers, and macros are generally also supported. The first assembly code in which a language is used to represent machine code instructions is found in Kathleen and Andrew Donald Booth's 1947 work, ''Coding for A.R.C.''. Assembly code is converted into executable machine code by a utility program referred to as an ''assembler''. The term "assembler" is generally attributed to Wilkes, Wheeler and Gill in their 1951 book ''The Preparation of Programs for an Electronic Digital Com ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DOS/32
DOS/32 is an advanced 32-bit DOS extender created for replacing DOS/4GW extender and compatibles. This extender can be used in various environments, from embedded systems to DOS emulators, by both developers and end users alike. Unlike DOS/4GW, DOS/32 is free, open-source and can be extended to create a unique executable file that incorporates the extender memory tool and main application code. Compatibility DOS/32 is compatible with MS-DOS 5.00 through 7.10, Windows 3.x, 95, 98 and Me, NT 3.51 and 4.0 (Service Pack 3 or later), 2000, XP and IBM OS/2 as well as OpenDOS and DOSEMU. DOS/32 has been tested and proved to be fully compatible with software which use DOS/4G, DOS/4GW, DOS/4GW Professional, PMODE/W and CauseWay DOS Extenders. Features The DOS Extender includes a built-in Advanced DOS Protected Mode Interface server supporting v0.9 of the DPMI specification and comes with a set of tools needed to create 32-bit protected mode applications. Like DOS/4G, it requir ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Daggerfall
''The Elder Scrolls II: Daggerfall'' is an open-world, action role-playing game published by Bethesda Softworks. The second video game in the ''Elder Scrolls'' series was released on September 20, 1996, for MS-DOS, following the success of 1994's '' The Elder Scrolls: Arena''. The story follows the player, sent by the Emperor, to free the ghost of King Lysandus from his earthly shackles and discover what happened to a letter sent from the Emperor to the former queen of Daggerfall. Compared to its predecessor, ''Arena'', the player can now only travel within two provinces in Tamriel: High Rock and Hammerfell; however, ''Daggerfall'' consists of 15,000 cities, towns, villages, and dungeons for the character to explore. ''Arena''s experience-point based system was replaced with a system that rewards the player for utilizing role-playing elements within the game. ''Daggerfall'' includes more customization options, featuring an improved character generation engine, as well as a GURP ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
M&T Books
Markt+Technik is a publisher of books and magazines based on computer topics which was established in 1976. The publisher became well known in the 1980s and 1990s through the publications of computer magazines such as ''64'er'', ''Power Play'', '' Happy Computer'' and ''Computer Persönlich''. The publishing house also published books and software for home computers, in particular for the Commodore 64, including dBASE and GEOS. They also published compendia for programming and PC applications. In the 1990s, the book business was separated from the magazine business. The magazines were initially spun off into the subsidiary ''Magna Media Verlag AG'' and then later (around 1998) introduced into the ''WEKA Verlagsgruppe''. In February 2013 the Pearson Pearson may refer to: Organizations Education *Lester B. Pearson College, Victoria, British Columbia, Canada *Pearson College (UK), London, owned by Pearson PLC *Lester B. Pearson High School (other) Companies *Pearson PLC ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Markt&Technik
Markt+Technik is a publisher of books and magazines based on computer topics which was established in 1976. The publisher became well known in the 1980s and 1990s through the publications of computer magazines such as ''64'er'', ''Power Play'', '' Happy Computer'' and ''Computer Persönlich''. The publishing house also published books and software for home computers, in particular for the Commodore 64, including dBASE and GEOS. They also published compendia for programming and PC applications. In the 1990s, the book business was separated from the magazine business. The magazines were initially spun off into the subsidiary ''Magna Media Verlag AG'' and then later (around 1998) introduced into the ''WEKA Verlagsgruppe''. In February 2013 the Pearson Pearson may refer to: Organizations Education *Lester B. Pearson College, Victoria, British Columbia, Canada *Pearson College (UK), London, owned by Pearson PLC *Lester B. Pearson High School (other) Companies *Pearson PLC ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
CMP Technology
UBM Technology Group, formerly CMP Publications, was a business-to-business multimedia company that provided information and integrated marketing services to technology professionals worldwide. It offered marketers and advertisers services such as print, newsletters, custom web sites, and events. Its products and services include newspapers, magazines, Internet products, research, education and training, trade shows and conferences, direct marketing services and custom publishing. Headquartered in San Francisco, California, UBM Technology Group was a part of UBM, a global business-to-business (B2B) events organiser which in turn owned by Informa and later absorbed into Informa Tech. History In 1971, Gerard "Gerry" Leeds and his wife, Lilo, founded the company as CMP Publications Inc. in Manhasset, New York. Their sons Michael and Daniel managed the company in 1988, and launched TechWeb in 1994. CMP Media went public in 1997. CMP Media acquired McGraw-Hill Information Technology ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DOS/4G
DOS/4G is a 32-bit DOS extender developed by Rational Systems (later Tenberry Software). It allows DOS programs to eliminate the 640 KB conventional memory limit by addressing up to 64 MB of extended memory on Intel 80386 and above machines. Features Functioning as a highly flexible and reusable memory extension library, DOS/4G allowed programmers to access extended memory without writing specialized code. It embeds itself in the executable file at linking time and executes before main application code, so usually DOS/4G initialization messages show up at launch. It can in principle operate within MS-DOS, PC DOS, DR-DOS and other DOS clones, the DOS boxes of OS/2, Microsoft Windows, Windows NT and Windows 95, and DOS emulators such as DOSBox. However, in practice few DOS/4G games or other applications will run on non-DOS-based versions of Windows, including Windows NT, Windows 2000 and Windows XP, since none of these allow direct access to the hardware as was used for disp ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Addison-Wesley
Addison-Wesley is an American publisher of textbooks and computer literature. It is an imprint of Pearson PLC, a global publishing and education company. In addition to publishing books, Addison-Wesley also distributes its technical titles through the O'Reilly Online Learning e-reference service. Addison-Wesley's majority of sales derive from the United States (55%) and Europe (22%). The Addison-Wesley Professional Imprint produces content including books, eBooks, and video for the professional IT worker including developers, programmers, managers, system administrators. Classic titles include ''The Art of Computer Programming'', ''The C++ Programming Language'', ''The Mythical Man-Month'', and ''Design Patterns''. History Lew Addison Cummings and Melbourne Wesley Cummings founded Addison-Wesley in 1942, with the first book published by Addison-Wesley being Massachusetts Institute of Technology professor Francis Weston Sears' ''Mechanics''. Its first computer book was ''Progra ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DOS Protected Mode Interface
In computing, the DOS Protected Mode Interface (DPMI) is a specification introduced in 1989 which allows a DOS program to run in protected mode, giving access to many features of the new PC processors of the time not available in real mode. It was initially developed by Microsoft for Windows 3.0, although Microsoft later turned control of the specification over to an industry committee with open membership. Almost all modern DOS extenders are based on DPMI and allow DOS programs to address all memory available in the PC and to run in protected mode (mostly in ring (computer security), ring 3, least privileged). Overview DPMI stands for DOS Protected Mode Interface. It is an API that allows a program to run in protected mode on 80286 series and later processors, and do the calls to real mode without having to set up these CPU modes manually. DPMI also provides the functions for managing various resources, notably Computer Memory, memory. This allows the DPMI-enabled programs to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
