2,889 Topics
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| | Hello, I am trying to compare two characters of different strings but it quits the loop. I know i am accessing the right chars caz i have tested it with print multiple times. [CODE].data mainNumPhrases: .word 4 mainPhrases: .word mainPhrase1 .word mainPhrase2 .word mainPhrase3 .word mainPhrase4 mainPhrase1: .asciiz "abcdefghijklmnopqrstuvwxyz" mainPhrase2: … |
| | Hi everyone! I feel like I've come a long way in my "quest" of creating a 16-bit toy os, since I last posted in these forums. Currently, the problem is that my CPU encounters an error, trying to switch to protected mode, and therefore shuts down the computer. This is … |
| | Hello everyone. I am wondering how to get started with ASM. I tried a few times to install things like radASM (and others) but I don't really know what they are all for. Can someone just tell me how to get started and about compilers/builders? Thanks.  |
| | Hi All, I have the following program to convert Lower case character to uppercase letters org $4000 Alph equ 26 26 Alphabets begin lea LC,A0 store lowercase to A0 lea UC,A1 store uppercase to A1 move.b #Alph,d1 sub.b #1,d1 loop move.b (A0)+,d0 convert LC to UC sub.b #32,d0 move.b d0,(A1)+ … |
| | I am coming back with a load address error with the first line in main (la $a0, test_str). I have been trying to figure out why. I am probably thinking to hard. Any help would be appreciated. [CODE] .data pali0: .asciiz "Go deliver a dare, vile dog" pali1: .asciiz "Some … |
| | Hello, I'm having a small problem with my program for assembly. I have to write an assembly language that finds the maximum of y = x^6 – 14x^2 - 56x for the range -4 ≤ x ≤ 6, by stepping one by one through the range. Here is my code … |
 | Is it possible to write direct machine language instructions to the processor and have them executed in some manner?  |
| | Hi, I wanna ask.. suppose I have an array and a constant called threshold in my data segments [CODE]array db 1,2,3,4,5,6 threshold equ 5 [/CODE] I want to compare my array elements with the constant, and only display/print the number which is less that the threshold, if there are none, … |
| | Hey All, Just wanted to know how to correctly use the OUT instruction for the x86 instruction set I'd like to output some data on the serial port which for me is 3F8h IRQ4. So I set up a test program as follows: [CODE] .386 .model flat,stdcall .code main PROC … |
| | The code runs fine if the first input integer is the largest, but if the second or third are larger it crashes or stops. I used the error message to determine that the code jr $ra stops the program. If I run another program I made that has that same … |
| | so what exactly is an instruction? 1.) is an opcode considered an instruction? 2.) is an operand also considered an instruction? 3.) is a combination of an opcode & operand makeup a legal "definition" of an instruction? |
| | can someone add some comments here so i can understand the process of the codes im a beginner here at assembly language by the way im using tasm for assembly [CODE].model small .stack .data msg1 db 13,10,"Enter a string with dollar symbol as a break :$" msg2 db 13,10,"Modified string … |
| | hi guys i am supposed to design a microprofessor as my university project please help me to program my device, i mean i need the assembly code for programing my device , if anyone knows about microprofessor's code , please let me know |
| | I've run into a bit of a problem with my OS.. Displaying large amounts of information; like so- [CODE]mazemsg db 0x70,"Maze game: How to play--",0 db 0x74,"-Arrow keys for movement",0 db 0x7C,"-Move into the red crates to move them",0 db 0x7E,"-Push a crate onto yellow dots to clear both the … |
 | I am writing this thread not to ask how to make an operating system, but to say how to make an operating system. There always seems to be new threads created asking how to make an operating system. [b]The simple answer[/b] There is no simple answer. Making an operating system … |
| | Here is my code [code].section .data values: .int 0 array_end: .equ ARRAY_SIZE, array_end - values array_fmt: .asciz " %d" usort_str: .asciz "unsorted array:" sort_str: .asciz "sorted array:" newline: .asciz "\n" maxvalue: .int 1000 format: .asciz "%d" message: .asciz "Please enter a maximum size for the array to be sorted." output: … |
| | can someone please explain why that is the answer to the question. for question 3, i thought it would be a) and c) thanks, 1 Circle which of the following (it could be any number of them) are flags that will be set (to 1) when 0x80 and 0x40 are … |
| | My homework says: Write an assembly language program that, when given an integer n, will calculate the value of the expression (2n^2-1)2 + n^3. Your program is to get the value for n from ECX and is to leave the value of the expression in EAX. (Note: The name of … |
| | [CODE]# Fahrenheit to Celsius .data # Following are data prompt: .asciiz " \n Please input degrees in fahrenheit: " # prompt user for input result: .asciiz " Degrees in celsius is: " # display degrees in celsius bye: .asciiz " Program terminated " # display when program terminates .globl main … |
| | I have tried to set the colors of the vga color palette here is my code: [CODE] mov ax, 0x13 int 0x10 mov ax, 0xa000 mov es, ax mov al, 2 mov bh, 63 mov bl, 0 mov ch, 0 call SetPalette mov si, 344 mov byte [es:si], 2 Hang: … |
| | Hi ,I just started learning assembly ,and I have a question when we add unsigned 255 and 1 in 8 bit registry CF=1 and OF=1 right, and how do we realize if this numbers are sign or unsigned Thanks |
| | I'm trying to code a VERY simple PE compiler/assembler that uses calls to the Win32 API, but I can't work out from the documentation what memory model a loaded PE "sees". It seems to be flat, but in that case how does the OS/processor handle near (16 bit) jmp/call instructions? … |
| | Im trying to create a small program where it asks for a number (radius) and then calculates the area of a circle. BUT when I square the input and multiply it by pi, i get a whole number. I need it in decimal. Could someone explain? Thanks. [CODE]TITLE Area of … |
| | Hello, in IDA i have: [CODE] mov ecx, offset dword_000001 mov eax, ecx mov ecx, [eax] [/CODE] why i can not change this to: [CODE] mov ecx, offset dword_000001 mov ecx, [ecx] [/CODE] ? thanks |
| | Hi folks! :) I'm here with a problem of Assembly 8086 (x86) (NASM). I´m trying calculate the sum of all numbers, which are odd, lowers than X (X = number defined by user) Already solved the problem in C # and C + +, but i need the Assembly Code. … |
| | can everyone tell how to write emu8086 to solve this question : - sum=1+2+3+...+2n-1 - p=1*2*3*...*10 |
| | Hello Guys I want to make an assembly program that get 2 inputs and compare between them if equal or not and if not I want to say which number is the maximum and which one is the minimum I did the Equal part , I need help with the … |
| | [CODE]; A NOR B = NOT(A AND B) ;NOT(A AND B) = NOT(A) or NOT(B) .ORIG x3000 LD R1,DATA1 ; load in data LD R2,DATA2 ; Load in data AND R1,R1,R2 ; AND THE TWO VALUES NOT R1,R1 ; NOT THEM HALT DATA1 .FILL #5 DATA2 .FILL #6 .END[/CODE] |
| | Hi, We had to program a 8086 assembly program for an university project, for which I found a very good guide (Art of Assembly), which explains very well how to use the basic CPU & FPU instructions. I got very intrested in assembly language, and would like to learn how … |
| | I have read about how multicore processing works of the Intel. The manual that I read had left out a part that would of been useful how to actually use multiple cores. It just explained how all the different parts of the CPUs interact with each other, so could someone … |
| | I am wondering how to change the VGA resolution and the video memory pointer in real mode assembly (nasm). I have no idea how to do this, so can anyone help me? |
| | I'm trying to make some code that directly interfaces with the VGA card(in real mode), I know the ports(0x3c6, 0x3c7, 0x3c8, 0x3c9) I need to use to output data on the screen. My code is this: [CODE] mov ax, 0 out 0x3c8, ax ;plot pixel at location 0 mov ax, … |
| | Hello, i have a noob question. Could you please answer me, what do this means? [CODE]call dword ptr [ecx+5Ch][/CODE] i can not get, what does this +5Ch (its s backslash "\"), but what it means in this calling? Thanks! |
| | I program using masm to make 32 bit programs. I need help converting some C code to assembly. Could someone help me? Thanks.  |
| | hello every body code below make directory in an address that is define in data part. ; create c:\emu8086\vdrive\C\test1 mov dx,ah mov ah, 39h int 21h but i want to get address from user. i can do this with macros . anyone know this with intrrupts? best Regard |
| | Usually to print on screen a integer of 2 numbers i divides it for 10 and then use int 21h with mov ah,2 to print the 2 results. However with integers with more than 2 numbers it starts getting complicated and the method i use becomes really too long . … |
| | Hello, I tried to convert below code, but I couldn't.. What is wrong? [code=c] void invert(unsigned char *image, int width, int height){ for(int i=0;i<width*height;i++) image[i]=255-image[i]; } [/code] [code=assembly] ---------------------ASM--------- invert PROC push ebp ; save ebp register mov ebp,esp ; get current stack pointer mov esi,[ebp+8] ; get first parameter … |
| | I had tried to make a compare strings function in real mode assembly, but it didn't work, so I tried it another way and it did. It seems to me that both functions I wrote do the same thing yet one doesn't work. Can someone tell me why, the two … |
| | Hey, i have a quick coding question. im programming in in ARM Assembler. my problem is that i need to find out the number of data values in a memory location, eg [CODE] AREA Test, DATA, READWRITE data_values DCD -16,100,-456,7,-123,-42,126789,2349,-34,-2344,45,-45,-3345 END [/CODE] so how do i find out that there … |
| | WHY SOME COMMANDS DONT WORK IN CMD LIKE "@" my program always have an error whenever i have this command! |
| | hi im new to assembly lang!im using cmd debug in doing program but some command didn't work!like @ and some other command can anyone help me! |
| | Hello all, So I am NEW to all this, and I have a quick question with some code of mine. When I open this code in PC SPIM I get the following error: spim: (parser) syntax error on line 18 move $a0, $t4 #move the number to print into $a0 … |
| | I I'm trying to create an application in real mode that uses the flags to store the results of calculations and other stuff. I'm trying to do this to take up less memory. So can someone please give me some example code or tell me how to do this. I … |
| | I can't get my pointers in assembly to work, I'm using nasm and trying to use pointers in real mode with 16-bit registers. Here is my code: [CODE] mov di, Pointer mov ah, 0x0e mov al, [di] int 0x10 Pointer: db "W" [/CODE] This code should print out the character … |
| | Title tell me .model small .stack 100h .data msg1 db 0Dh,0Ah, "TYPE A DECIMAL NUMBER >> $" msg2 db 0Dh,0Ah,0Dh,0Ah, " In BINARY >> $" buffer db 7,?, 5 dup (0), 0, 0 binary dw ? illegal db 10,13,'not valid, TRY AGAIN: ','$' ctr DB ? PROMPT_2 DB 0DH,0AH,0Dh,0Ah,' In … |
| | I want to write a program changing the notation of all hexadecimal numbers found in an assembly source file from traditional (<decimal_digit><hex digits>h) to C-style (0x<hex_digits>). I dont understand how can i read the file and change the notation. I am new to assembly programming and any help would be … |
| | Hello, I have this code: [code] .data xd db "jjjj",0 .code ; ««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««««« LibMain proc instance:DWORD,reason:DWORD,unused:DWORD .if reason == DLL_PROCESS_ATTACH push dword ptr ds:[ xd] call Teste mov eax, TRUE ; return TRUE so DLL will start .elseif reason == DLL_PROCESS_DETACH .elseif reason == DLL_THREAD_ATTACH .elseif reason == DLL_THREAD_DETACH .endif … |
| | An integer is loaded in from memory. ran through two loops to determine the tens place and the ones place. Integer is stored back to memory and displayed. Example #98 Tens place -->9 Ones place -->8 :) |
| | hi all friend!! last week I downloaded one software name "winasm" . they said this program can write assembly but i don't know how to write in this program.Does everyone know ?? thank |
| | Hello I have to do a MIPS project that I have to divide a 64 bit int. How can I do this? Please Guide me. Thanks |
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