Coding and running programs in DEBUG A, the ASSEMBLE command. The R command has the following syntax: R The R command will display all registers unless the optional field is entered, in this case only register named will be displayed altered. The register (R) command allows you to examine alter the contents of the internal registers of the CPU. Examining and altering the contents of registers R, the REGISTER command. To exit Debug, simply type Q (quit command) after the DEBUG prompt: Q After the Q and enter key (carriage return) have been entered, DEBUG will return you to the DOS level. DEBUG is now waiting for you to type in a command. Invoking Debug: To invoke the DEBUG program, a user opens command promote window and enters the following: COMMANDS IN DEBUG Entering and exiting DEBUG Run DOSBOX, then type Z C Change its drive to C, type Z C: At the C drive, enter the DEBUG program, simply type its name at the DOS level: C After DEBUG and enter key (carriage return) have been entered, the DEBUG prompt will appear on the following line. DEBUG Environment Debugging Functions Some of the basic functions that the debugger can perform are the following: Assemble short programs View a source code along with its machine code View the CPU registers and flags (See Table 1 below) Trace or execute a program, watching variables for changes Enter new values into memory Search for binary or ASCII values in memory Move a block of memory from one location to another Fill a block of memory Load and write disk files and sectors Debug Commands: The following table shows a list of some commonly used DEBUG commands. You can step through the program one line at a time (called tracing), making it easier to find logic errors. You can use DEBUG to test assembler instructions, try out new programming ideas, or to carefully step through your program. It displays the contents of memory and lets you view registers and variables as they change. Introduction: DEBUG program which is supplied with both DOS and Windows, is the perfect tool for writing short programs and getting acquainted with the Intel 8086 microprocessor. This program is a basic tool to write, edit and execute assembly language programs. 1 DOS Debug Command Objective: To introduce the program that comes with and Windows operating systems. Preview text Microprocessor System Experiment No.
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