CS 301 Fall 2001 – Chapter 3 Slides by Prof. Hartman, following “IBM PC Assembly Language Programming” by Peter Abel 9/17/2018

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. 9/17/2018

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 9/17/2018

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 9/17/2018

DEBUG Examples Work through examples in the text: pages 36—48. 9/17/2018