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Power-Programmierung CD 2 (Tewi)(1994).iso
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history.txt
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1993-09-16
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DOS/NT started in 1988 as an experiment in writing device drivers in C for
Microsoft's MS-DOS1. Both block and character device drivers were written,
along with special C data structures to match the MS-DOS request packet. It
was then recognized that using the same techniques, an operating system
could be written that would take advantage of the C language features and
would require much less time to develop than the traditional assembly
language techniques. Although UNIX2 had proven this earlier, it was not
tried with a traditional pc operating system.
At this time, a minimal operating system using the device drivers written
earlier along with a new 8086 interrupt API was developed. It was called
XDOS and proved to be a functional operating system. This new operating
system was used to develop booting techniques and a C library SDK was
developed for it.
XDOS enhancements were started in 1989 and MS-DOS was chosen as the new API.
A more advanced architecture was also developed. This included the use of
an IPL (intermediate program loader) to set up the operating environment
prior to loading the operating system itself and reentrant system calls
facilitating real-time applications. This version, know as NSS-DOS, was
completed and demonstrated in 1991. As a result of these demonstrations,
NSS was approached to supply source license for this operating system by a
major defense contractor. The only new requirement - it had to run on 68K
processors.
This presented a new challenge. Due to the MS-DOS model used for the API,
NSS-DOS relied heavily on a segmented architecture. To meet this challenge,
a major redesign of NSS-DOS was undertaken. New proprietary techniques were
developed that allowed the same source to be compiled on a variety of hosts
and with a wide range of compilers. This new version, DOS/NT, was the result o
f this new project. The kernel was redesigned as a micro kernel along with
logical separation of the filesystem, memory and task managers. A new DOS
API was designed along with a new DOS SDK to guarantee portability.
Additionally, all processor unique code was separated from the core
functions. The result is the highly portable operating system that DOS/NT
represents.
MS-DOS is a trademark of Microsoft Corporation.
UNIX is a trademark of USL, Inc.
Networks Software Systems, Inc.
23 Cornwall Road
Freehold, NJ 07728
Voice: (908) 206-0320
Fax: (908) 303-9364