IBM 1130 User Manual page 458

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the other programs. If a program is deleted, the
remaining program(s) are moved up on the disk
in order to utilize disk storage effectively.
Detailed descriptions of the 1130 Monitor System
and its components may be found in the Systems
Reference Library (SRL). For Version 1 see
IBM 1130 Disk Monitor System (C26-3750). For
Version 2 see IBM 1130 Disk Monitor System,
Version 2, Programming and Operator's Guide
(C26-3717).