$3$:$48$

Debug

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EXPLORING THE SOFTWARE ARCHITECTURE OF THE $80$x$86$ MICROPROCESSOR

NAME:

STUDENT ID:

Objectives

Learn how to:

Bring up the DEBUG program.

Examine and modify the contents of the $8086\text{'}$s code internal registers.

Examine and modify the contents of the $8086\text{'}$s code, data, and stack segments of memory.

Calculate the physical address of storage locations in the memory address space.

Examine the contents of the dedicated parts of the $8086\text{'}$s memory address space.

Code assembly language instructions into machine code.

Assemble instructions into the memory of the PC$.$

Unassemble machine code instructions stored in memory.

Store and load machine code instructions from a diskette.

Execute an instruction to determine the operation it performs.

Part $1$: Loading the DEBUG Program

Here we willlearn how to bring up the DEBUG program from the keyboard of the PC$.$ The laboratory procedures the follow assume that the PC has a floppy disk driver called A and a hard disk, drive C; that is$,$ either a PCXT or PCAT is in use. It is also assumed that the DOS directory on drive $C$ contains the DEBUG.EXE program and that the path is set to this directory.

Procedure

Turn on the PC$,$ enter the DOS operating system environment.

Load DEBUG by issuing the command

C: DOS$>$ DEBUG $()$

What prompt do you see on the screen?

Return to the DOS operating system by entering the command

$[$LAB$01-1]$

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$Q()$

What prompt is now displayed?