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DEBUG / ASSEMBLY TUTORIAL By Fran Golden. Debug is a command in DOS, MS-DOS, OS/2 and Microsoft Windows ( only x86 versions, not x64 ) which runs the program debug.exe ( or DEBUG.COM in older versions of DOS ). This is a debug tutorial to assist the student who needs to know the inner-workings of the Intel based computer. The objective of this material is to instruct the student in observing the contents of the microprocessor and all of the memory locations that the processor can address. After you become familiar with debug and how it looks at addresses, You will be introduced to machine level programming, using debug as an assembler. At the end of this tutorial ( 11 lessons ) you should have a good understanding of the IBM system board and low level programming, been able to: look at the DOS data area in memory to determine what kind of equipment is installed on the mother board; look at the internal workings of DOS at such things as the keyboard buffer, real time clock, interrupt vector table, rom bios chip and the video ram chips to name a few; recover deleted files from a floppy or hard disk; recover data from a disk that is un-readable by DOS and is otherwise lost; do diagnostic's on some of the hardware, such as, video display, printers, disk drives and chips; low level format a hard-drive; finally, you can assemble small COM programs using the 8088 instruction set.
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