Ms 6541 Ver 2.1 Manual Pdf3/24/2021
One example of NT OS2 1.x support is in the WIN2K resource kit.For the similarly named Digital Research operating system, see CPM.
This version was released on 25 September 1996. Developer IBM Microsoft (1.01.3) Written in C, C and assembly language Working state Historical, now developed as ArcaOS Source model Closed source Initial release December 1987; 33 years ago ( 1987-12 ) Latest release 4.52 December 2001; 19 years ago ( 2001-12 ) Marketing target Professionals, servers Available in English, French, German, Italian, Spanish, Portuguese, Russian Platforms x86, PowerPC Kernel type Hybrid kernel Default user interface Workplace Shell Graphical user interface License Proprietary Succeeded by First by eComStation, then ArcaOS Official website www-01.ibm.com. The first version of OS2 was released in December 1987 and newer versions were released until December 2001. Notably, basic system calls were modeled after MS-DOS calls; their names even started with Dos and it was possible to create Family Mode applications text mode applications that could work on both systems. Because of this heritage, OS2 shares similarities with Unix, Xenix, and Windows NT. The original release is textmode -only, and a GUI was introduced with OS2 1.1 about a year later. OS2 features an API for controlling the video display (VIO) and handling keyboard and mouse events so that programmers writing for protected-mode need not call the BIOS or access hardware directly. Other development tools included a subset of the video and keyboard APIs as linkable libraries so that family mode programs are able to run under MS-DOS, citation needed and, in the OS2 Extended Edition v1.0, a database engine called Database Manager or DBM (this was related to DB2, and should not be confused with the DBM family of database engines for Unix and Unix-like operating systems). ![]() HPFS provided a number of improvements over the older FAT file system, including long filenames and a form of alternate data streams called Extended Attributes. In addition, extended attributes were also added to the FAT file system. Ms 6541 Ver 2.1 Drivers For ManyIn addition, OS2 lacked device drivers for many common devices such as printers, particularly non-IBM hardware. Windows, on the other hand, supported a much larger variety of hardware. The increasing popularity of Windows prompted Microsoft to shift its development focus from cooperating on OS2 with IBM to building its own business based on Windows. Microsoft favored the open hardware system approach that contributed to its success on the PC; IBM sought to use OS2 to drive sales of its own hardware, including systems that could not support the features Microsoft wanted. Ms 6541 Ver 2.1 Code To MeasureMicrosoft programmers also became frustrated with IBMs bureaucracy and its use of lines of code to measure programmer productivity. IBM developers complained about the terseness and lack of comments in Microsofts code, while Microsoft developers complained that IBMs code was bloated. OS2 was announced when Windows 2.0 was near completion, and the Windows API already defined. However, IBM requested that this API be significantly changed for OS2. Therefore, issues surrounding application compatibility appeared immediately. OS2 designers hoped for source code conversion tools, allowing complete migration of Windows application source code to OS2 at some point. However, OS2 1.x did not gain enough momentum to allow vendors to avoid developing for both OS2 and Windows in parallel. IBM insisted on supporting the 80286 processor, with its 16-bit segmented memory mode, because of commitments made to customers who had purchased many 80286-based PS2s as a result of IBMs promises surrounding OS2. Until release 2.0 in April 1992, OS2 ran in 16-bit protected mode and therefore could not benefit from the Intel 80386 s much simpler 32-bit flat memory model and virtual 8086 mode features. This was especially painful in providing support for DOS applications. While, in 1988, Windows386 2.1 could run several cooperatively multitasked DOS applications, including expanded memory (EMS) emulation, OS2 1.3, released in 1991, was still limited to one 640 kB DOS box. From a business perspective, it was logical to concentrate on a consumer line of operating systems based on DOS and Windows, and to prepare a new high-end system in such a way as to keep good compatibility with existing Windows applications. While it waited for this new high-end system to develop, Microsoft would still receive licensing money from Xenix and OS2 sales. Windows NTs OS2 heritage can be seen in its initial support for the HPFS filesystem, text mode OS2 1.x applications, and OS2 LAN Manager network support. Some early NT materials even included OS2 copyright notices embedded in the software.
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