|
Tenberry Software
Tenberry Software (previously Rational Systems) was a software company notable for the development of DOS/16M and DOS/4G, which were the first industry standard DOS extenders. See also * Phar Lap Phar Lap (4 October 1926 – 5 April 1932) was a New Zealand-born champion Australian Thoroughbred horse racing, racehorse. Achieving great success during his distinguished career, his initial underdog status gave people hope during the ear ... - competitor References External links Tenberry Software Defunct software companies of the United States Companies based in Phoenix, Arizona {{US-software-company-stub ... [...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 di ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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] |
Phar Lap (company)
Phar Lap Software, Inc., was a software company specializing in software development tools for DOS operating systems. The company was named after the champion New Zealand racehorse Phar Lap. They were most noted for their software allowing developers to access memory beyond the 640 KiB limit of DOS (DOS extenders) and were an author of the VCPI standard. Phar Lap Software, Inc. was founded in April 1986 by Richard M. Smith, Robert Moote, and John M. Benfatto. Their first major success, ''386, DOS-Extender'', a 32-bit protected mode development tool, was released in November 1986. Phar Lap’s product line was expanded to include ''386, VMM'', a virtual memory add-in driver, ''LinkLoc'', a linker-locator for embedded development; cross tools for embedded development; and ''286, DOS-Extender'', a DOS extender that emulated an OS/2 environment, complete with the OS/2 API and protected mode, in contrast with Microsoft's OS/2 API emulation, which ran OS/2 applications in real mode ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Defunct Software Companies Of The United States
Defunct may refer to: * ''Defunct'' (video game), 2014 * Zombie process or defunct process, in Unix-like operating systems See also * * :Former entities * End-of-life product In Industry (economics), industry, product lifecycle management (PLM) is the process of managing the entire lifecycle of a product from its inception through the Product engineering, engineering, Product design, design, and Manufacturing, ma ... * Obsolescence {{Disambiguation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
