Yes, DWORD alignment is always preferred. But check with the standard literature on optimization:

http://www.agner.org/optimize/

Use: [msg]

Try this:MOV AL, DAY
CBW
DIV DIVISOR

As to where Daniweb is located, a little 'net searching can shed light on that. For instance, I found this Frugal Friday interview which is very interesting to listen to:...

Just a quick note about this "unaurthaurised distribution" of a protected product: Microsoft has provided an authorized download (including a valid install key) of its OSs in certain instances.
...

wildgoose -

Please consult the Narue tutorial that tomtetlaw was talking about:

http://www.daniweb.com/forums/thread41309.html

Pay attention to the discussion of the C calling convention.

wildgoose -

What you are thinking of is the old '*.com' and '*.exe' formats for DOS which had a segmented memory model. Yes, the '*.com' files were restricted to the SMALL data model which...

No, wildgoose. What you are saying simply can not happen.

The sections are separated in the object file. The linker may even choose to re-order them when it creates the executable file. The...

Which gcc port are you using? If it is cygwin, then that might be your problem.

Try MingW -- I've always had success with it.

http://www.mingw.org/

An alternative is to use the Alink downloads:

http://alink.sourceforge.net/download.html

; To assemble: nasm -f obj hw.asm
; To link: alink -oPE hw .obj win32.lib

extern MessageBoxA ...

Here is a wonderful resource to help you understand the proper use of FPU instructions:

http://webster.cs.ucr.edu/AoA/Windows/HTML/RealArithmetic.html#998833

For 64-bit specific information, look here:

http://www.turboirc.com/asm/

http://www.vikaskumar.org/wiki/index.php?title=X86-64_Tutorial

http://www.x86-64.org/
...

Well, clock cycles certainly do not equate to execution time on modern processors. But, if you still think you need to know this information, then go directly to the source:
...

Microsoft has good C code with excellent descriptions at its Win32 API reference library:

http://msdn.microsoft.com/en-us/library/aa373078(VS.85).aspx

Click on the "Performance Counters...

To write text to the console, first use GetStdHandle:

http://msdn.microsoft.com/en-us/library/ms683231(VS.85).aspx

Use that to get the handle for the StdOut device. Then you can use this...

Some 64-bit resources:

http://www.viva64.com/links/64-bit-development/

http://www.vikaskumar.org/wiki/index.php?title=X86-64_Tutorial

http://msdn.microsoft.com/en-us/library/ms794533.aspx
...

http://www.viva64.com/links/64-bit-development/

http://www.vikaskumar.org/wiki/index.php?title=X86-64_Tutorial

http://msdn.microsoft.com/en-us/library/ms794533.aspx

http://www.x86-64.org/
...

Insert a CWD instruction right before the DIV instruction. This will sign-extend AX into the DX:AX pair needed for the ('dword' divided by 'word') division.

Nathan.

You will need to tweak 'termios' to get non-buffered input to work. Read this thread for code and discussion of the issue:
...

There is a nice tutorial in this thread:

http://www.daniweb.com/forums/thread41309.html

For 64-bit, you'll find resources (and Linux examples) here:
...

These tutorials will show you how:

http://win32assembly.online.fr/tutorials.html

Some Assemblers that have 64-bit support:

FASM
http://flatassembler.net/

NASM
http://www.nasm.us/

YASM
http://www.tortall.net/projects/yasm/

Some resources and existing code to learn from:

http://asm.sourceforge.net/

[note: the AsmUtils package has not been updated for years, so some of those examples will not work on modern...

Ah, but my example stays within the specs. The question said *nothing* about the data being pre-computed or not:

Write a program that prints the numbers from 1 to 100. But for multiples of three...

The first rule of code optimization is:

Eliminate conditional branches. Use lookup-tables instead.

The second rule of code optimization is:

If possible, remove any loops.

So, keeping to...

Some suggested reading material:

http://www.drpaulcarter.com/pcasm/

http://www.kipirvine.com/asm/

http://savannah.nongnu.org/projects/pgubook

http://webster.cs.ucr.edu/AoA/index.html

I posted this because I consider it a "trick question" to some extent. As we hone our "problem-solving" skills, it is natural for us to attempt a clever solution. All too often, however, clever...

An application programmer doesn't use interrupt (int) calls in Windows. Instead, one makes a call to a function in one of the DLLs supplied by the system. The reference for these functions can be...

It's a FizzBuzz question designed to "separate the men from the boys", so don't cheat. :)

Write a program that prints the numbers from 1 to 100. But for multiples of three print “Fizz” instead of...

Thank you! It looks nice.

BTW, I can confirm that if you remove the underscores ( change the "_main", "_printf", and "_scanf" symbols to just "main", "printf", and "scanf" ) it assembles ( using...

Yes. Please post the code. I would like to see it.

Nathan.

Here is a nice "cheat sheet" for getting "up and running" quickly:

http://freeengineer.org/learnUNIXin10minutes.html

Frank recently posted the following code in the alt.lang.asm newsgroup.


;---------------------------------
; nasm -f bin -o hwnoint.com hwnoint.asm

org 100h

push word 0B800h ;...

Processor manuals are your best choice.

Intel --
http://www.sandpile.org/docs/intel/ia-32.htm

AMD --
http://www.sandpile.org/docs/amd/k6.htm

Download "disasm.zip" from the Files section of AoAProgramming:

http://groups.yahoo.com/group/aoaprogramming/

It is a good place to start on coding a modern-day disassembler/debugger.
...

Taking the "fright" out of Opcodes and Hex-numbers.

High Level Assembly (HLA) is a modern assembler + standard library package that allows a programmer to ease his way toward ASM coding by...

That is a DOS system call... it will only work on Linux if you are running a DOS emulator. Nothing wrong with that, but since you are using Linux, why not run your programs natively? Some Linux...

Here is some reading material:

http://del.icio.us/Evenbit/OS

Nathan.

You have several "int 0x21" calls in your code. These are DOS calls:

http://www.ctyme.com/intr/int-21.htm

Since DOS is not loaded (indeed, you are writing your own OS), then you cannot use...

You can find tutorials and examples here:

The Operating System Resource Center
http://www.nondot.org/sabre/os/articles

OS FAQ Wiki
http://www.osdev.org/osfaq2/

Nathan.