Problem — Write an assembly language program in microprocessor to divide a 16 bit number by an 8 bit number. Example —. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute. See your article appearing on the GeeksforGeeks main page and help other Geeks.
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Latest commit 11b9e79 May 11, Simple Assembly Language Programs based on About Assembly language is a low level programming language. These programs are intended for those who are familiar with assembler, or have a bit of idea about it.
But even if you are familiar with assembler, it is still a good idea to look through this document in order to study Emu syntax. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window. May 11, Updated Readme.Prerequisite — program to find the factorial of a number Problem — Write an assembly language program for calculating the factorial of a number using microprocessor.
Assumptions — Starting address of program: Input memory location: Output memory location: and This means that the DX register holds the high part and the AX register holds the low part of a bit number. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute. See your article appearing on the GeeksforGeeks main page and help other Geeks. Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.
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8086 program to find the factorial of a number
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Assembly language is a low level programming language. You need to get some knowledge about computer structure in order to understand anything. The simple computer model as I see it: The system bus shown in yellow connects the various components of a computer. RAM is a place to where the programs are loaded in order to be executed. SI - source index register. DI - destination index register.
BP - base pointer. SP - stack pointer. Despite the name of a register, it's the programmer who determines the usage for each general purpose register.
The main purpose of a register is to keep a number variable. The size of the above registers is 16 bit, it's something like: b in binary formor in decimal human form. Therefore, when you modify any of the 8 bit registers 16 bit register is also updated, and vice-versa. The same is for other 3 registers, "H" is for high and "L" is for low part. Because registers are located inside the CPU, they are much faster than memory. Accessing a memory location requires the use of a system bus, so it takes much longer.
Accessing data in a register usually takes no time. Therefore, you should try to keep variables in the registers. Register sets are very small and most registers have special purposes which limit their use as variables, but they are still an excellent place to store temporary data of calculations.
DS - generally points at segment where variables are defined. ES - extra segment register, it's up to a coder to define its usage. SS - points at the segment containing the stack.
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Although it is possible to store any data in the segment registers, this is never a good idea. The segment registers have a very special purpose - pointing at accessible blocks of memory. Segment registers work together with general purpose register to access any memory value. This is good, since this way we can access much more memory than with a single register that is limited to 16 bit values.
Other general purpose registers cannot form an effective address! Flags Register - determines the current state of the processor. IP register always works together with CS segment register and it points to currently executing instruction. Flags Register is modified automatically by CPU after mathematical operations, this allows to determine the type of the result, and to determine conditions to transfer control to other parts of the program.
Generally you cannot access these registers directly.The x86 instruction set refers to the set of instructions that x86 -compatible microprocessors support. The instructions are usually part of an executable program, often stored as a computer file and executed on the processor.
The x86 instruction set has been extended several times, introducing wider registers and datatypes as well as new functionality. Most if not all of these instructions are available in bit mode; they just operate on bit registers eaxebxetc.
See also x86 assembly language for a quick tutorial for this processor family. The updated instruction set is also grouped according to architecture iii and more generally is referred to as x86 32 and x86 64 also known as AMD They are usable for both integer and floating point operations, see below.
MMX instructions operate on the mm registers, which are 64 bits wide. They are shared with the FPU registers. Added with Pentium MMX. Added with 6x86MX from Cyrixdeprecated now. The following instructions can be used only on SSE registers, since by their nature they do not work on MMX registers. Added with Xeon series and initial Core 2.
Added with Core 2 manufactured in 45nm. Added with Phenom processors. Added with Nehalem processors. Introduced with the bulldozer processor core, removed again from Zen microarchitecture onward. Supported in AMD processors starting with the Piledriver architecture and Intel starting with Haswell processors and Broadwell processors since Fused multiply-add floating-point vector multiply—accumulate with three operands.
Supported in AMD processors starting with the Bulldozer architecture. Not supported by any intel chip as of Fused multiply-add with four operands. Introduced in Intel's Xeon Phi x The x86 CPUs contain undocumented instructions which are implemented on the chips but not listed in some official documents. They can be found in various sources across the Internet, such as Ralf Brown's Interrupt List and at sandpile. In some implementations, emulated through BIOS as a halting sequence.
It interacts with ICE mode. From Wikipedia, the free encyclopedia. List of x86 microprocessor instructions. This article may be too long to read and navigate comfortably. Please consider splitting content into sub-articles, condensing it, or adding subheadings. November Main article: AES instruction set.
The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. I've written a pretty simple code in asm x and I'm facing an error. If anyone could help me with a brief explanation I would greatly appreciate it.
With the correction for the add to be replaced by mov as noted in your comment Note that the line: add al, [bx] is actually mov al, [bx] there's just the function call at the label EndLoop that's wrong!
You want to display the sum, and are using the DOS print function. This function 09h expects a pointer in DS:DX that you are not providing! Even if you did, you would still have to convert the sum number in its text representation. A quick solution here would be to content yourself and just display the result in the form of a single ASCII character. The hardcoded sum is 52 and so it is a displayable character:.
I would personally change it to take the address of target buffer in si as another call argument ie. Like this:.
x86 assembly language
Then to call this at your EndLoop you need to add into data segment numberStr DB 8 DUP 0 to have some memory buffer allocated for string and add into code:. Learn more.
Assembly Sum of an array, printing multi-digit numbers Ask Question. Asked 3 years, 5 months ago. Active 2 years, 6 months ago. Viewed 13k times. Peter Cordes k 29 29 gold badges silver badges bronze badges. Dor George Dor George 93 1 1 gold badge 3 3 silver badges 9 9 bronze badges. I think a brief explanation is here: stackoverflow.
Most of people here will use their knowledge and experience to do a "dry run" in their head, and to make it easier for them, you should provide every relevant detail just imagine yourself reading your question with zero knowledge about how your setup looks. Active Oldest Votes. Fifoernik Fifoernik 8, 1 1 gold badge 15 15 silver badges 25 25 bronze badges. You probably want to display result of sum?
Ped7g Ped7g This would be simpler and more efficient if it just stored into the buffer directly and did dec si inside the div loop, instead of pushing onto the stack and popping in a separate loop.