IBM 5280 Distributed Data System - Index of

data table: A table defined by the .TABLE controlstatement.decimal register: A 16-byte register wherein data is storedin EBCD IC or signed decimal numbers and is used forarithmetic/logical operations.default value: A value automatically chosen by thesystem when a value is not specified by the user.DE/RPG: Data Entry with RPG Subroutines. A 5280program product that provides a means for writi-ng programsthat provide the function required for a specific job.device address: Four hex characters used to identify a5280 I/O device such as a diskette drive or printer.device microprocessors: The microprocessors that controlI/O devices, such as the keyboard/display microprocessor,diskette microprocessor, printer attachment microprocessor,and communications microprocessor. The device microprocessorsare controlled by the main microprocessor.diacritic: A modifying mark that changes the phoneticvalue of a character. When you enter a diacritic from thekeyboard, the cursor does not advance until anothercharacter is entered to combine with the diacritic.diacritic table: A table in keyboard/display storage thatdefines diacritic characters and valid diacritic-charactercomposites for graphic display.direct access method: An access method for processingfiles by specifying the address (record number) or keyvalue of each record to be accessed.direct addressing: A method of addressing in which theaddressed storage location contains the desired data. Seealso indirect addressing.direct by key access method: An access method forprocessing index data files by specifying the key associatedwith each record to be accessed. The current key specifiedneed not have any relative sequence with the last key ornext key to be specified.diskette attachment: Controls the function for up to fourdiskette drives and includes the hardware adapter, a microprocessor,and read only storage (ROS).diskette drive: The mechanism used to read and writediskettes.diskette head: The device that moves a diskette past arcad/'v·v'rite mechanism.diskette labels: The header (HDR1) and volume (VOLl)labels that are recorded on a diskette to describe the datasets on the diskette.displacement: The number of bytes from the beginningof a partition or block to the beginning of a particular dataarea.display/alter: A diagnostic function that allows data instorage to be displayed and changed.displayattribute.s: The characteristics assigned to a fieldrecord that control the way the data is displayed.display mode: The mode in which the prompts, displayattributes, and the contents of the current record bufferare displayed, but the cursor is not displayed and no datacan be entered. This mode is used to inspect prompts anddisplay attributes of a screen format.double register: Two decimal or binary registers usedtogether as one data area. In a source program, the leftmostregister is referenced, followed by the length inparentheses (4 for binary, 32 for decimal).dup: Abbreviation for duplicate.EBCDIC (extended binary-coded decimal interchangecode): A character set containing 256 eight-bit characters.edit format: A description of a record that is read from adiskette, written to a diskette or printer, or moved fromone storage location to another. An edit format is set upby a FMT series of control statements in an assembler program,and defines the fields, punctuation, data types, andother editing requirements of the record.ELAB/ETAB: Parameter in the .COMM and .DATASETcontrol statements that specifies the name of a routine(ELAB) or table (ETAB) to be used to handle error orexternal status conditions.enter mode: The mode in which the operator initiallyenters data through a display station. Some editing andinteraction may occur. See also verify mode: updatemode.E-type data exchange: A diskette data exchange formatthat uses blocked and spanned, blocked and unspanned, orunblocked and unspanned records. Block size can be upto 16256 bytes.364