IBM 5280 Distributed Data System - Index of

input record: A data record that is transferred to computer:>torage for piOcessing.insert field: A field not present in the enter record, butwhich will be inserted by the system and will be presentin the output record.insert mode: The mode, initiated by the Ins key, in whichthe operator can insert characters into a field at the currentcursor position. The cursor, the character above the cursor,and all characters to the right of the cursor are shifted tothe right.instruction: A statement that specifies an operation to beperformed by the computer and the locations in storageof all data involved in that operation.lOB: Input/output control block.lOB pointer: A 4-byte block in the system control areathat contains the address of a device lOB and other information(such as, if the device is installed).IPL: Initial program load.I-type data exchange: A diskette data exchange format thatuses 128-,256-,512-, or 1024-byte sectors. All records ina data set must be the same length. All records in the dataset are blocked and spanned. The I-type exchange allowsyou to exchange data between the 5280 and other systemsthat use the I-type data exchange.keyboard bit map: Control bits in the keyboard/displaylOB that correspond to functions that are totally orpartially processed by the keyboard/display microprocessor.An application program written in assembler language canset these bits to indicate that the corresponding function isto be handled by the application program.keyboard/display storage: An area of control storageseparate from main storage, which provides control informationand refresh areas for processing keystrokes and fordisplaying characters on the screen.keyword: A word, coded in source statements, that representsspecific attributes and functions, and that is usuallyaccompanied by a string of one or more parameters.label table: A table of addresses set up by the. LABT ABcontrol statement, and used for indexed branches andindexed subroutine calls.label update: A data set type that allows the labels on thediskette index to be updated.logical buffer: An I/O buffer that contains a logical record,used to block and deblock logical records in the physicalbuffer.logical record: A record independent of its physicalenvironment. Portions of the same logical record may belocated in different physical records, or several logicalrecords or parts of logical records may be located in onephysical record, depending on the exchange type beingused.Magnetic Stripe ,Reader feature: Allows use of the 5280system only after a valid badge (operator ID) is read by anattached magnetic stripe reader.main microprocessor: The microprocessor that processesthe object code instructions and controls the devicemicroprocessors.main storage: (1) General purpose storage of a computer.(2) Storage that can be addressed by programs, fromwhich instructions can be executed, and from which datacan be loaded directly into registers.main storage duplication field: ,See auxiliary duplication.main storage store field: A field that is automaticallystored from the current record buffer into a main storagelocation.make/break key: A key that generates a scan code whenthe key is pressed, and another when the key is released.mandatory enter: A field attribute that indicates an operatormust enter at least one character into the displayedfield.mandatory fill: A field attribute that indicates an operatormust enter all or none of the displayed field.mask: A pattern of characters that is used to control theretention or elimination of another group of characters.microprocessor save area: Bytes marked as a microprocessorsave area contain information that depends upon the operationbeing executed, and is therefore unpredictable. Anapplication program must not change these bytes.366