Experts Exchange - Time Tested Solutions

September 5, 2008 03:06am pdt

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TheLearnedOne

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Time Tested Assembly Solutions: 26 - 50 of 115

Pentium III or higher: 64-bit / 128-bit integer operations

Hello, I would like to implement various mathematical operations using relatively large integers for several highly optimized mathematical analyses in C++. Are there simple assembly sequ...

rotating 2 stepper motor using control switch using PIC microcontroller

Im programming PIC 16F84 microcontroller using assembly to rotate 2 stepper motors. Here's the scenario, 1 switch will control the motor, if I press the button the 1st motor rotates if I press...

How fast is your ASM Base64 Encoder?

I was just reading over an old Q here from several years ago... How fast is your ASM hex converter? http:/Assembly/Q_20272901.html which was more of a fun challenge than a real...

TROUBLE ADDING TWO NUMBERS IN ASSEMBLY

I believe the disp_sum (last) call is incorrect because the program will execute but the sum will not be displayed. Project is due tomorrow (11/27) so prompt assistance will be greatly apprec...

Interpreting some Assembly code

Code some one help me with what the following code is trying to achieve Thanks

CRC-16 Checksum - How to determine Polynumerial with given data stream...

hi everyone, I'm trying to reverse engineer some crc checking on a old piece of software that is no longer supported... I have the following examples of what is transmitted... AA 01 02 0...

Learning ASM

This question will have different parts to it, I will award 100 points per part answered. I will however start the points at 100, so if not answered in full, you will still get points: a)I...

Multiplication in assembly

Dear experts, I'm trying to learn assembly language based on available resources online, but I'm stumped in multiplication. I've tried to look for other tutorials on the internet, but I sti...

Fibonacci in Assembly code

Generate the first 21 members of the Fibonacci sequence, store them in Memory, and use Dump Memory to display the sequence using Assembly code for intel based computers. I am trying to use us...

Simulate keypress in x86 assembly

I am working on a program which runs in a "DOS" command prompt window. I would like a function that can toggle the fullscreen mode of this window, like pressing Alt+Enter. I think that embed...

How to clear hyperterminal screen in 8051 assembly programming

Hi, Currently I am doing 8051 assembly project which need me to make some selection on hyperterminal screen. I am facing a problem to clear current screen when I am suppose to display anoth...

Interrupts related

What is difference between DOS Interrupts and BIOS Interrupts? Please explain 3-4 differences. thanks.

How fast is your ASM hex converter?

Note [3/24/2002]: Continuing at http://www.experts-exchange.com/assembly/Q.20280946.html Note [3/31/2002]: And then continued here: http:Q.20283475.html Just throwing out the gauntlet: W...

Recommendation for ***free*** online Assembly tutorials

Hi, I am an industrial strength C++ programmer with over 12 yrs experience. One of the things that has, up until now, eluded me is a good grounding in assembly. Most of the time this is not a...

sse memcpy performance

I wrote my own memcpy function which uses sse registers to copy memory via. Hence I found it does not boost performance. In fact for block size less than 128K it's even worse. For 128K is ins...

How to call an ASM Routine from C

I have created a routine in ASM and I wish to call it from a C function. What is the right way to do that with GCC?

Execution error NT Status Code 0xC000001d

I am debugging two piece of code which fails with NT status code 0xc000001d (ILLEGAL_INSTRUCTION). They are valid instruction and I have no idea why. Is it possible that it is hardware problem...

How do I write an x86 assembly recursion function

How do I write an x86 assembly function that recursivly calculates exp(2,n) ie 2^n using the stack to pass n. Please note the code below is stuck in a loop only run in your debugger, plus i...

How to change assembly opcode in EXE file

I have an exe file containing a JMP assembly instruction: Assembler: jmp 0052E4A8 with opcode E9 28 08 00 00 From what I understand the opperation (JMP) is identified by the f...

pic 16f876 assembly language subroutine

produce a PIC 16F876 ASSEMBLY LANGUAGE SUB - ROUTINE WHICH WILL DISPLAY AN EIGHT BIT BINARY VALUE AS A HEXADECIMAL VALUE ON THE DUAL TIME MULTIPLEXED SEVEN SEGMENT DISPLAY OF THE SUPERPIC PCB

convert all the upper-case letters in a string into lower-case

How do I convert all the upper-case letters in a string into lower-case. (The starting address of the string is passed to the subroutine in index register X.)

Assembly Language understanding

I have the following assembly code and I wonder if anyone can help me to find out which assembly code line corresponds to the C code I have. movl a, %eax movl x, %edx leal (%eax,...

Convert 80x86 assembly code to C, small loop program

I need the following assemble code converted to C code. The bsf instruction is the main part that I do not know. Thanks mov eax, 80000000h mov bx, 4000 loop1: bsf ecx,eax /(Bit Scan F...

Arithmatic operation for 32 bit integer and 64 bit integer on 32 or 64 bit system

I have 32 bit architecture OS. I want to do 32 bit and 64 bit integer arithmatic operations. - How 32 bit integer operations differ from 64 bit integer operations on 32 bit machine. - How 32...

Convert 80x86 assembly code to C Part 3

I need to convert some intel/wind32 asm code to c code. See below. int tick = 0; __asm out 070h, al __asm xor ax, ax __asm in al, 071h __asm mov word ptr tick, ax please feel...