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CS 301 Fall 2001 – Chapter 3

CS 301 Fall 2001 – Chapter 3. Slides by Prof. Hartman, following “IBM PC Assembly Language Programming” by Peter Abel . Using DEBUG. Tutorial on the web. Appendix C in the book. DEBUG is not case sensitive. All numbers are hexadecimal. Spaces are used to separate parameters.

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CS 301 Fall 2001 – Chapter 3

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  1. CS 301 Fall 2001 – Chapter 3 Slides by Prof. Hartman, following “IBM PC Assembly Language Programming” by Peter Abel

  2. Using DEBUG • Tutorial on the web. • Appendix C in the book. • DEBUG is not case sensitive. • All numbers are hexadecimal. • Spaces are used to separate parameters. • Segments and offsets are specified as segment::offset.

  3. DEBUG Commands • A Assemble instructions • C Compare two areas of memory • D Display contents of memory • E Enter data into memory • F Fill memory • G Run the executable in memory. (Go) • H Perform hexadecimal arithmetic • I Input and display one byte from a port. • L Load a file or disk sectors into memory. • M Move (or copy) memory

  4. DEBUG Commands 2 • N Name a program • O Output a byte to a port • P Proceed (execute CALL, LOOP, INT or REP) • Q Quit • R Display the contents of one or more registers • S Search memory • T Trace the execution of one instruction • U Unassemble (disassemble) machine code. • W Write a (named, .COM) file to disk • ? Display help screen

  5. DEBUG Examples • Work through examples in the text: pages 36—48.

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