Optimize the boot image updating process before updating to mavericks

The first version of OS/2 was released in December 1987 and newer versions were released until December 2001.OS/2 was intended as a protected mode successor of PC DOS.OS/2 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.In addition, development tools include a subset of the video and keyboard APIs as linkable libraries so that family mode programs are able to run under MS-DOS.(The interface was replaced in versions 1.2 and 1.3 by a look closer in appearance to Windows 3.1).The Extended Edition of 1.1, sold only through IBM sales channels, introduced distributed database support to IBM database systems and SNA communications support to IBM mainframe networks.However, IBM requested that this API be significantly changed for OS/2.

optimize the boot image updating process-40optimize the boot image updating process-2

OS/2 was announced when Windows 2.0 was near completion, and the Windows API already defined.Microsoft favored the open hardware system approach that contributed to its success on the PC; IBM sought to use OS/2 to drive sales of its own hardware, including systems that could not support the features Microsoft wanted.Microsoft programmers also became frustrated with IBM's bureaucracy and its use of lines of code to measure programmer productivity.Notably, basic system calls were modelled 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.It was code-named "CP/DOS" and it took two years for the first product to be delivered.

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