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.
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