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DEBUG (DOS Command) : ウィキペディア英語版
Debug (command)

debug is a command in DOS, OS/2 and Microsoft Windows (only in 32bit〔According to (Microsoft Macro Assembler Reference ), inline assembly is not supported for x64.〕) which runs the program debug.exe (or DEBUG.COM in older versions of DOS).〔(【引用サイトリンク】title=A Guide to DEBUG )〕 Debug can act as an assembler, disassembler, or hex dump program allowing users to interactively examine memory contents (in assembly language, hexadecimal or ASCII), make changes, and selectively execute COM, EXE and other file types. It also has several subcommands which are used to access specific disk sectors, I/O ports and memory addresses.〔

==Background==
Traditionally, all computers and operating systems have included a maintenance function, used to determine whether a program is working correctly. Debug was written by Tim Paterson to serve this purpose in QDOS. When Paterson began working for Microsoft in the early 1980s he brought the program with him. Debug was part of and has been included in MS-DOS and Microsoft Windows. DOS debug has several limitations:
* It can only access 16-bit registers and not 32-bit extended registers.
* When the "n" subcommand for naming files is used, the filename is stored from offset DS:5D to DS:67 (the Program Segment Prefix File Control Block area), meaning that the program can only save files in FAT 8.3 filename format.
Enhanced DEBUG package includes a 32-bit clone "DEBUGX" version supporting 32-bit DPMI programs as well. Andreas "Japheth" Grech, the author of the HX DOS extender, developed enhanced DEBUG versions 0.98…1.25, and former PC DOS developer Vernon Brooks added versions 1.26…1.30.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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