Run-Time Abstraction Services Navigation menuexpanding ite

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FirmwareIBM mainframe technologyComputing stubs
firmwareoperating systemsIBM System iIBM System pOpen Firmware
Run-Time Abstraction Services (RTAS) is run-time firmware that provides abstraction to the operating systems running on IBM System i and IBM System p computers.
It contrasts with Open Firmware, in that the latter is usually used only during boot, while RTAS is used during run-time.
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