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1. Top results related to assembly language

   • Assembly Language instruction into Machine language instruction

     Top Answer

     Answered Jul 20, 2016 · 1 votes

     Looking at the documentation included in the question, there are several instructions that are being proposed. The machine has four 8 bit registers which are numbered R0, R1, R2, and R3 which are addressed using two bits.

     The op codes for the instructions are specified as two hex digits in the documentation. However in the actual implementation, the op code area of the instructions are not two hex digits in size so you have to take the hex value and shift the value left by 2 bits. So an op code for a load of 0x30 (0011 0000) is left shifted resulting in 0xC0 (1100 0000 in binary) or the op code for a store of 0x32 (0011 0010) is left shifted resulting in 0xC8 (1100 1000) and the register number of zero to three is inserted into the lower two bits of the two hex digits.

     The load from address instruction is ld Ri,xxxx where xx is a 16 bit address of the location containing the 8 bit value to load into the register. This load instruction sets the specified 8 bit register (R0, R1, R2, or R3) with the 8 bit value at the specified address.

     The actual bit formats for the load instruction are: (1) op code (0x30) in the most significant 6 bits followed by (2) the register number (0 - 3) in the next two bits followed by (3) an 16 bit value that is an address to the value to load.

     The ld R1,0x10A should then look like 1100 0001 0000 0001 0000 1010 in binary which separates out as 1100 00 as the op code 0x30, 01 as the register number R1, and 0000 0001 0000 1010 which is 0x010A.

     The load immediate ld R3,$-12 should look like 1100 0111 1111 0400 as -12 is 0xfff4

     The add R1,R3 should look like 0100 0001 1100 0000 assuming the unused bits are set to zero. This would be 010000 as the 0x10 op code for add, 01 for register R1 and 11 for register R3. The remaining 6 bits in the second 8 bit part of the add instruction are unused and ignored.

     The sto R1,0x10B should look like 1100 1001 0000 0001 0000 1011 which is op code of 0x32, register 1, to be stored at the 16 bit address of 0x010B.

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   • Assembly Language (Irvine)-a macro that waits for a keystroke and returns the key that was pressed

     Top Answer

     Answered Nov 03, 2015 · 2 votes

     You tried to compile a 16-bit real mode code to a 32-bit protected mode executable. That won't work. Add a /omf to the command line of ml.exe and ensure that link16.exe will be used as linker.

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     2/5

   • Assembly language, program to check if a number is divideable by 2 and print numbers in a loop

     Top Answer

     Answered Jun 03, 2018 · 4 votes

     If the number for which you want to test if it's divisible by 2 is in number1 and you know that the word division div bx actually divides DX:AX then you need to move the number to AX and zero DX.

     check:mov ax, number1 xor dx, dxmov bx, 2div bx

     The actual determination then comes from inspecting the remainder from this division by 2. The remainder is in the DX register!

     cmp dx, 0je divisible-

     But all of this is overkill since testing to see if a number is even aka divisible by 2, is a simple matter of looking at its lowest bit:

     test number1, 1jz divisible-

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     3/5

   • Assembly language 8086 - How to set a size for the input & how to calculate it?

     Top Answer

     Answered Sep 03, 2021 · 1 votes

     I want to know how to set the length for the input and also how to get the size of the string that is entered by the user.

     The easiest would be to use the DOS.BufferedInput function 0Ah. You can read about it in How buffered input works.

     set the length

     You seem to expect user input that has 1 or 2 digits. Then a buffer with 3 bytes is fine; room for at most 2 characters and a terminating carriage return.

     INBUF db 3, 0, 3 dup (0)

     You use it like:

     lea dx, INBUF mov ah, 0Ah int 21h

     get the size

     This is how you read the length of the inputted text:

     mov cl, [INBUF + 1]mov ch, 0 ; -> CX is either 1 or 2

     Assuming the user inputs 5 enter, then from the code above the CX register would hold 1. You then convert the character "5" into the value 5 by subtracting 48, like in:

     mov al, [INBUF + 2]sub al, 48

     Total = 1.5 * number of stops traveled * number of ticket * 105%

     How do I perform the calculation?

     That's a whole different question for which you should show us your best effort. I think that with the help of today's answer, you should be able to start working on that...

     One tip though: don't let the decimal point fool you, you can calculate this entirely using integer instructions.

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     4/5

   • Also try

     assembly language programming	assembly language code
     assembly language compiler	x86 assembly language
     assembly language tutorial	assembly language examples
     computer organization and assembly language	mips assembly language

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2. en.wikipedia.org › wiki › Assembly_languageAssembly language - Wikipedia

   en.wikipedia.org › wiki › Assembly_language

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   In computer programming, assembly language (alternatively assembler language or symbolic machine code), often referred to simply as assembly and commonly abbreviated as ASM or asm, is any low-level programming language with a very strong correspondence between the instructions in the language and the architecture's machine code instructions.

3. www.tutorialspoint.com › assembly_programmingAssembly Programming Tutorial - Online Tutorials Library

   www.tutorialspoint.com › assembly_programming

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   Learn the basics of assembly language, a low-level programming language for a specific computer architecture, and how to convert it into machine code. This tutorial is designed for beginners who have a basic understanding of computer programming terminologies.

   Code sample

   section .text

     global _start ;must be declared for linker (ld)

   _start: ;tells linker entry point

     mov edx,len ;message length

     mov ecx,msg ;message to write...

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4. www.geeksforgeeks.org › what-is-assembly-languageWhat is Assembly Language? - GeeksforGeeks

   www.geeksforgeeks.org › what-is-assembly-language

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   May 27, 2024 · Learn what assembly language is, how it works, and why it is used for low-level programming. Find out the components, advantages, disadvantages, and FAQs of assembly language with examples and code snippets.

5. www.baeldung.com › cs › assembly-languageIntroduction to Assembly Language | Baeldung on Computer Science

   www.baeldung.com › cs › assembly-language

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   Mar 18, 2024 · Learn the basics of assembly language, a low-level programming language that uses mnemonics instead of numeric codes. See examples of MIPS assembly code and compare it with Python code for the same tasks.

6. www.cs.princeton.edu › lectures › 13_Assembly1Assembly Language: Part 1 - Princeton University

   www.cs.princeton.edu › lectures › 13_Assembly1

   • In assembly language • In a high-level language! • Write safer code • Understanding mechanism of potential security problems helps you avoid them – even in high-level languages • Understand what’s happening “under the hood” • Someone needs to develop future computer systems • Maybe that will be you!

   • File Size: 679KB

   • Page Count: 57

7. www.codecademy.com › learn › computer-architectureComputer Architecture: Assembly Language | Codecademy

   www.codecademy.com › learn › computer-architecture

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   Learn about Assembly languages and the role they play in computer architectures. Write your own Assembly code and see how closely Assembly code maps to binary code.

8. People also ask

   What is assembly language?

   • Assembly language (or Assembler) is a compiled, low-level computer language. It is processor-dependent since it basically translates the Assembler's mnemonics directly into the commands a particular CPU understands, on a one-to-one basis. These Assembler mnemonics are the instruction set for that processor. ^ Carnes, Beau (2022-04-27).

   Assembly language - Wikipedia

   en.wikipedia.org/wiki/Assembly_language

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   Why are assembly languages important?

   • Assembly languages eliminate much of the error-prone, tedious, and time-consuming first-generation programming needed with the earliest computers, freeing programmers from tedium such as remembering numeric codes and calculating addresses. They were once widely used for all sorts of programming.

   Assembly language - Wikipedia

   en.wikipedia.org/wiki/Assembly_language

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   How assembly language is converted into executable machine code?

   • Assembly language is converted into executable machine code by a utility program referred to as an assembler like NASM, MASM, etc. This tutorial has been designed for those who want to learn the basics of assembly programming from scratch.

   Assembly Programming Tutorial - Online Tutorials Library

   www.tutorialspoint.com/assembly_programming/index.htm

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   How do I write a machine code in assembly language?

   • Assembly language for the 8086 family provides the mnemonic MOV (an abbreviation of move) for instructions such as this, so the machine code above can be written as follows in assembly language, complete with an explanatory comment if required, after the semicolon. This is much easier to read and to remember.

   Assembly language - Wikipedia

   en.wikipedia.org/wiki/Assembly_language

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9. www.britannica.com › technology › assembly-languageAssembly language | Definition & Facts | Britannica

   www.britannica.com › technology › assembly-language

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   Learn about assembly language, a type of low-level computer programming language that uses symbolic equivalents of machine language. Find out how assembly language works, what it is used for, and how it differs from other languages.