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==Legacy datasets only==
EXCP is sometimes confused with a direct access storage device access method, but it is not for direct access storage devices exclusively; rather, it is a general purpose low-level device access interface which supports any ''legacy'' device type and any ''legacy'' dataset organization. For accessing ''all'' device types and ''all'' dataset organizations, the more general [[Start Input/Output]] interface (STARTIO) is available in MVS/370 and subsequent instances of the OS although it is not an officially supported interface.
==Simplified operations on direct access datasets==
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