Debug
Computer program
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The line-oriented debugger DEBUG.EXE is an external command in operating systems such as DOS, OS/2 and Windows.
DEBUG can act as an assembler, disassembler, or hex dump program allowing users to interactively examine memory contents, make changes,... Wikipedia
Developer(s): Microsoft, IBM, Digital Research, Novell, Caldera
Original author(s): Tim Paterson
Written in: MS-DOS: x86 assembly language