How To Troubleshoot Problems While Debugging Windows 98

• DEBUG story
• Start
• Changes in DEBUG
• For Windows ™ 9x / Me
• For Windows ™ NT / 2000 / XP and higher
• Resume
• But PCE works even on Windows 10!
• Best DEBUG clone (also for getting 32-bit code!)
• DEBUG Limitations
• Important initialization values ​​for DEBUG
• Debug with . Use EXE files
• Special repositories in MS-DEBUG
• own dynamic stack area DEBUG
• Did you find the correct bug in DEBUG?
• Important notes on using DEBUG
• All orders – in alphabetical order
• Short links to command help

SECOND PAGE:

• How to use COMMANDS
• Command parameter values ​​
• Detailed help for each order (starts here)
• A sample program for you to enter, run and edit in DEBUG.
• Note. via IHC Win 9x chain in floppy boot sectors
• Application
• 8086 Processor Registers
• FLAGS register
• Segment used by DEBUG: offset addressing method

Debut

B In 1980, Tim Paterson began work on an excellent 16-bit operating system for the Visa 8086 S-100 bus. he did it for SCP (Seattle Computer Products) In the past year. To help you, QDOS. receive (later classified as 86-DOS) Tim created the correct debugger in the ROM chip to work properly; this particular code for this ROM version seems to have been posted on the Public Domain. Later Tim code executed as a suitable .COM program under And qdos also added the ability to successfully crack machine code 8086. Meanwhile, Microsoft® quickly acquired the rights to sell Tim’s QDOS with IBM® regarding his “secret” PC project. Phil was then hired by Microsoft. as the main author of his first operating system. Once completed, he works for IBM. Personal Computer ™ DOS 1.00 in 1981, its DEBUG.COM utility Contained in thoughts. All the functions that Put tim does DEBUG do still exist besides, at that time little was added (the biggest exception is the assembly Order; added for DOS 2.0).
[ sent to Tim Paterson himself for review this look at the early days of DEBUG. ]

Changes In MS-DEBUG

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With DOS output 2.DEBUG, had the ability to create instructions directly in machine code ( Order). For many, this is one of the most important teams with its User. Although it lacks the features of a stand-alone assembler, for example, all jumps must appear at hexadecimal addresses (labels cannot be used often), many helpful .COM guides have been compiled using this command. DOS Face = “Verdana, 3.0, added P (Proceed) command to quickly start DEBUG Subroutines; at the same time there was an opportunity to try a step only interrupts with the T command (trace). When DOS did EMS (Extended Function Memory) available in DOS 4.0, four requirements xa, xd, xm and xs were different in DEBUG. They seem to be rarely, if ever, used by programmers. For most of us, the only noticeable change in DEBUG was the addition of from the main help command (enter ‘?’ while in DEBUG) in DOS 5.0; every time DOS gets all the commands finally /? Command line switch.

DEBUG code now available thanks to a number of improvements (as well as “bug fixes”) over time! Some of these internal improvements have been made to the DOS system calls as well as the display. Exit then the type file is transferred from another .COM to nprogram .EXE. with DOS 5.0. But, despite all these changes, and after them others, DEBUG, undoubtedly, officially revision since 2.40 (these numbers have Integrated into all DOS DEBUG versions 3.0). We can only guess why Microsoft® was never updated DEBUG to handle instructions outside of the Intel® 8086/8087/8088 processor instructions. Microsoft® has its own assembler (MASM), “C” compiler and Debugger (CodeView); you can use it too if it was willing to pay absolutely extra, this could be one of his reasons that, using MASM and CodeView, many have chosen our cheaper Borland® Assembler (TASM) in Turbo ™ debugger when they are released, and even some another commercial product. However, users and students can always find out more. a lot about assembler with DEBUG.

DEBUGGING On Windows® 9x / I

Internal structure all these versions of DEBUG for Windows® are very different from the previous ones DOS forms; although b in advance. While this seems like a great option, it has become You are still researching the phrase “verse 2.40,” but in a different place. Windows® itself has been disabled for a while due to many changes such as: to be able to work with the new file system, FAT32 and large disks. But without start using its source code, we cannot be sure if there were any significant differences in DEBUG. Updates can involve something as simple as a reorganization the most important error messages when working with source code and / or new assembler / linker.

DEBUG has always been bought great tool in the hands of any batch programmer, but for a while the current implementation of Windows ™ 95 and, in particular, Windows ™ 98, this performance degraded when its I / O Orders are in doubt! Whether it’s a “bug” in DEBUG itself or the peculiarity of Windows® is that I / O Windows ™ 9x / Me commands are for direct use on your hard drive! If you run My

William Vaux