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some platform-specific details, giving programs direct access to the hardware resources.

 

allow programmers to write device-independent,  by providing standard Operating System (OS) calls to hardware.

 

 The same type of abstraction is made in operating systems, but OS APIs now represent the primitive operations of the machine, rather than an ISA. This allows a programmer to use OS-level operations (i.e. task creation/deletion) in their programs while still remaining portable over a variety of different platforms.

via Hardware abstraction – Wikipedia, the free encyclopedia.

 

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