"Proceed" in DEBUGĭon't use "Trace" to trace an INT instruction use Simply add them to your DOS command line when you call DEBUG: C:> debug argument1 argument2 arg3. If you want to supply command line arguments to a program being debugged, Single-steping through it using the "Trace" or "Proceed"Ĭommands, watching the flow of control and the values of the registers.
With your program in memory, you are now ready to debug it by Your first instructions, ready to be traced: C:> debug COM programs start at segment offset 0100h, so that's where you'll find The quickest way to get the executable loaded intoĭEBUG is to give the program you wish to debug as a command argument.Īll. Tracing COM file programsĭEBUG is able to load and let you single-step through ".COM"įormat executables. Screen dumps, so that the text doesn't overflow the right margin and wrapĭo not use Notepad to print screen text - the output font is almostĪlways too large, causing the lines to wrap. Wordpad or Write let you choose a smaller font size for printing your When you finally print some screen text, dump information, traces, or programs, you must use a Courier or Terminal fixed-width font so Output from DEBUG: debug_dump_out.txt Output Format for screens and dumps Here is an example of a script file that dumps the BOOT sectorĪnd first ROOT directory sector of a floppy disk (drive A:): Redirection, necessary for saving your DEBUG output into files for later If you're trying to dump disk sectors (as you do in Project 4 in thisĬourse), you may find these kinds of DEBUG scripts, used with command line
Writing Scripts for Disk Sector Debugging I've edited the outputįile to add comments explaining what I was doing in the script file, and how toĬreate the script file. Something works: C:\> debug outputfile Writing Scripts for Program DebuggingĪnd its corresponding output file debug_script_out.txt. Through DEBUG using command line redirection to get a quick idea of how Of DEBUG commands (and even include assembler instructions) and run them One of the handy things you can do with DEBUG is prepare small text files
#DOSBOX DEBUGGER WINDOWS#
Once you have your saved DEBUG output in a file, you can restart Windows on your computer and print the output files (using a Courier (You can also type the commands blind into DEBUG with just the You can enter a few DOS DEBUG commands into a text file (using a program suchįile and execute the commands while you redirect the output into an outputįile. Screen button won't work unless you have an attached text printer on yourĬomputer, and neither will the mouse function to cut-and-paste.īelow under the heading Writing DEBUG Scripts. If you're running in pure-DOS mode, without Windows running, the Print Write or Wordpad and print the text from there.) Saving output under DOS (pure DOS) The text only, using cut-and-paste into another application such as Using Print Screen - the resulting file is huge and unnecessary. (Do not save the entire bitmap window as a graphic Use the mouse to copy text from your DOS window and paste it into another application such as If you're running DEBUG in a DOS Window under Windows 9x, you can always Output in a file for later printing and hand-in. Sometimes, you can use the mouse to do this sometimes, you have to save the
Some of the course assignments require you to capture the output of DEBUG.
#DOSBOX DEBUGGER HOW TO#
General descriptions of how to use the DOS DEBUG command: Capturing output from DEBUG This page contains the following sections:įor more detailed understanding of the power of DEBUG, here are some links to Then saving the output to a file for later printing is an essential skill. Knowing how to supply DEBUG with a prepared sequence of instructions and The contents of disk sectors from your disk drives. To examine the contents of files, both plain and executable, and to examine This course makes extensive use of the DOS DEBUG command.
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