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System/34 BASIC has a very dangerous command called FREE. Typing FREE followed by a filename deletes that file without a trace. It will work for every user file, unless there is a conflict of security or an in-use condition that blocks it. System/34 BASIC has another dangerous command called LOCK.
M is the extent number for files with more than one extent (non-contiguous files). BB is zero. Previously this indicated the bin on an IBM 2321 Data Cell. CC is the absolute cylinder number on the device. HH is the track (head) number. R is the record number on the track. Record zero contains control information for the track and can not be used.
File status okay; about to open data connection. 200 Series: The requested action has been successfully completed. 202: Command not implemented, superfluous at this site. 211: System status, or system help reply. 212: Directory status. 213: File status. 214: Help message. Explains how to use the server or the meaning of a particular non ...
The System/34 could either swap out entire programs, or individual segments of a program in order to free up memory for other programs to run. One of the machine's most distinctive features was an off-line storage mechanism that utilized " magazines "—boxes of 8-inch floppies that the machine could load and eject in a nonsequential fashion.
The SDSF Primary option menu. The System Display and Search Facility (SDSF) is a component of IBM's mainframe operating system, z/OS, which allows users and administrators to view and control various aspects of the mainframe's operation and system resources using an interactive user interface.
IEFBR14 is an IBM mainframe utility program. It runs in all IBM mainframe environments derived from OS/360, including z/OS. It is a placeholder that returns the exit status zero, similar to the true command on UNIX-like systems. [1]
The Program Status Word (PSW) [2]: 71–72 contains a variety of controls for the currently operating program. The 64-bit PSW describes (among other things) the address of the current instruction being executed, condition code and interrupt masks.
Job Control Language (JCL) is a scripting language used on IBM mainframe operating systems to instruct the system on how to run a batch job or start a subsystem. [1] The purpose of JCL is to say which programs to run, using which files or devices [2] for input or output, and at times to also indicate under what conditions to skip a step.