gtpd2m0wData Communications Services Reference

Unit Record Support

Unit Record Support provides the facility to run jobs which require the use of unit record devices. This package provides routines for unit record device allocation, I/O macro processing, I/O initiation, I/O request queueing and I/O interrupt processing. Secondary functions such as UCS buffer load, FCB load, error logging and utility programs (card to printer, card to tape, etc.) are also provided. The Unit Record Support package provides programs to perform the functions using the following records. The functions are described in Functions.

CTKB
Keypoint Record B.

OB1IR
OBR/MDR Descriptor Record

OB0IR
Error Interface Record

UR0IO
Unit Record I/O DSECT

UR1ST
Unit Record Status Table