The blit debugger

Abstract
This paper describes the evolution to date of a flexible debugger for C programs on the Blit, a multi-processing bitmap terminal. The debugger is of interest for the following reasons: -- it is assisted by the terminal software's elegant separation of the debugger process from its subject process. -- it resides autonomously in the terminal and is bound dynamically to arbitrary subject processes. -- it executes asynchronously with its subject. -- its implementation is distributed as a small process in the terminal and a large process in the host timesharing system. -- its user interface uses graphics and a mouse. An opinion about the most fruitful direction for further application of graphics is offered.

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