A Data Control Block (DCB) is a description of a dataset in IBM mainframe operating systems, such as OS/360, MVS, and z/OS. A DCB is coded in assembler programs using the DCB macro instruction (which expands into a large number of "define constant" instructions). High-level language programmers use library routines containing DCBs.
A Data Control Block (DCB) is a description of a dataset in IBM mainframe operating systems, such as OS/360, MVS, and z/OS. A DCB is coded in assembler programs using the DCB macro instruction (which expands into a large number of "define constant" instructions). High-level language programmers use library routines containing DCBs.
Source: Wikipedia "Data Control Block" · CC BY-SA 4.0
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