Had an official revision since 2.40 (those digits haveīeen embedded inside all versions of DEBUG since DOS 3.0). EXE programīut in spite of all those changes and others which followed, DEBUG has never Output, then there was the change in file type from a. Some of these internal changes were related to DOS system calls and screen Through a number of changes ( and 'bug fixes' too) over the years! It appears they were rarely, if ever used though, even by programmers.įor most of us, the only noticeable change in DEBUG was the addition (Expanded Memory) functions available under DOS 4.0, Through Interrupts with the T (Trace) command. The P (Proceed) command was added, so DEBUG could quickly execute subroutines at the same time, it became possible to attempt stepping COM programs have been assembled with this command. Though lacking much of the functionality of a stand-alone Assembler,Į.g., all Jumps must be to hexadecimal addresses (no labels can be used), many This is one of the most important commands for many of its

Gained the ability to assemble instructions directly into machine code (theĪ command). [ Thanks go to Tim Paterson himself for reviewing There and little has been added to it (the major exception being the Assemble All the functionality that Tim put into DEBUG is still Personal Computer DOS 1.00 in 1981, his DEBUG.COM utility Tim was then hired by MicrosoftĪs the primary author of their first OS. In the meantime, Microsoft® hadīeen busy purchasing the rights to sell Tim's QDOS to IBM®įor their 'secret' PC project. COM program under QDOS, and also added the ability The code for that ROM version was released into the Public Domain. (later called 86-DOS) to work correctly, Tim created a debugger in a ROM chip He had designed for SCP ( Seattle Computer Products) the

The Segment:Offset Addressing method used by DEBUGġ980, Tim Paterson began working on a 16-bit OS for the 8086 S-100 Bus card.

An Example Program for you to Enter, Run and Edit under DEBUG.Ībout Win 9x's ' IHC' string in Diskette Boot Sectors.

Detailed Help on each Command (begins here).

All the Commands - Listed Alphabetically.

Important Initialization Values for DEBUG.

The best DEBUG 'Clone' (also for 32-bit code!).

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