DUCBD – Display DASD and TAPE UCB Information Utility for MVS38J / ISPF v 2.x / Hercules(current version 1.1.01  2024-01-01) The UCB (Unit Control Block) stores information regarding input/output devices on a MVS 38J operating system. Sometimes, it is necessary to inquire on some of that information for research purposes or general I/O device verification. DUCBD displays select control information … Continue reading DUCBD in MVS38J