An On-Line Debugger for OS/360 Assembly Language Programs.

by W. H. Josephs

Purchase Print Copy

 FormatList Price Price
Add to Cart Paperback28 pages $20.00 $16.00 20% Web Discount

A description of DYDE, an online debugging program for use by assembly language programmers on third-generation IBM computers. The ability to debug a program online can mean a significant reduction in the programmer's debugging effort. Many such online systems are available for other computers, notably DDT and its derivatives for the PDP computers, but none is widely known for the 360 system operating under OS, where dumps and offline traces must be used. DYDE (Dynamic Debugger) provides the programmer with DDT-like capabilities of break-point insertion, modification of data and code, and symbolic-label references. It can operate under any option of OS/360, using only a small, user-written "ping-pong" SVC and communicat- ing with the programmer by means of the 1052 operator's console (employing WTO and WTOR) or, preferably, the 2260 graphics console (using the OS Graphics Access Method support). 28 pp.

This report is part of the RAND Corporation Research memorandum series. The Research Memorandum was a product of the RAND Corporation from 1948 to 1973 that represented working papers meant to report current results of RAND research to appropriate audiences.

Our mission to help improve policy and decisionmaking through research and analysis is enabled through our core values of quality and objectivity and our unwavering commitment to the highest level of integrity and ethical behavior. To help ensure our research and analysis are rigorous, objective, and nonpartisan, we subject our research publications to a robust and exacting quality-assurance process; avoid both the appearance and reality of financial and other conflicts of interest through staff training, project screening, and a policy of mandatory disclosure; and pursue transparency in our research engagements through our commitment to the open publication of our research findings and recommendations, disclosure of the source of funding of published research, and policies to ensure intellectual independence. For more information, visit

The RAND Corporation is a nonprofit institution that helps improve policy and decisionmaking through research and analysis. RAND's publications do not necessarily reflect the opinions of its research clients and sponsors.