A Neutral Look at Operating Systems/OS slash 2

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Unix (BSD, Linux) | CP/M | DOS | Microsoft Windows | OS/2 | Mac OS

The title given to this book is incorrect due to technical limitations. The correct title is OS/2.

OS/2 is an operating system from IBM and Microsoft, that was intended as the successor to MS-DOS and Microsoft Windows.

OS/2 1.0

The first version of OS/2 uses a command line interface similar to that of MS-DOS. Unlike MS-DOS, it uses a protected mode kernel and dynamic linking and supports multitasking of native OS/2 applications, which use the same "New Executable" as 16-bit Windows applications, although the two APIs are incompatible. It also can run a single MS-DOS application at a time. This involves forcing the processor back into real mode.

OS/2 1.1, OS/2 1.2, OS/2 1.3

OS/2 1.1 added the Presentation Manager, a graphical user interface visually similar to Windows 2.0. Presentation Manager also expanded the OS/2 API.

OS/2 1.2 added the High Performance File System (HPFS), which allows filenames up to 255 characters and eliminated several other filename restrictions of the older File Allocation Table (FAT) file system. OS/2 1.2 also updated the appearance of Presentation Manager, creating the visual style more commonly associated with the later, more popular Windows 3.0. OS/2 1.3 is a bug-fix release.

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