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8086 instruction set with examples

cmp instruction in 8086

lea instruction in 8086 example

mov instruction in 8086

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instruction set of 8086 microprocessor notes

The MOV instruction. The MOV instruction is the most important command in the 8086 because it moves data from one location to another. It also has the widest variety of parameters; so it the assembler programmer can use MOV effectively, the rest of the commands are easier to understand. format: MOV destination,source.
Execution always starts from the first byte of the file. This file type is unique to Emu8086 emulator. Error Processing. Compiler reports about errors in a separate information window: MOV DS, 100 - is illegal instruction because segment registers cannot be set directly, general purpose register should be used: MOV AX, 100.
Another advantage of 8086 instruction set is that it is much smaller, and thus easier to learn. Emu8086 has a much easier syntax than any of the major assemblers, but will still generate a program that can be executed on any computer that runs 8086 machine code; a great combination for beginners! Note: If you don't use
29 May 2015 Where there are just constants involved, MOV (through the assembler's constant calculations) can sometimes appear to overlap with the simplest cases of usage of LEA. Where its useful Another form of the MOV instruction is MOV reg,immdata which means read the immediate data (i.e. constant) immdata into register reg.
In the x86 assembly language, the TEST instruction performs a bitwise AND on two operands. The flags SF , ZF , PF are modified while the result of the AND is discarded. The OF and CF flags are set to 0 , while AF flag is undefined. There are 9 different opcodes for the TEST instruction depending on the type and size of the
As you probably know from part 2 of this tutorial, MOV instruction is used to copy values from source to destination. Let's see another example with MOV instruction: ORG 100h. MOV AL, var1. MOV BX, var2. RET ; stops the program. VAR1 DB 7 var2 DW 1234h. Copy the above code to emu8086 source editor, and press F5
8086 will generate a type 0 interrupt. All flags are undefined after a DIV instruction. If you want to divide a byte by a byte, you must first put the dividend byte in AL and fill AH with all 0's. Likewise, if you want to divide a word by another word, then put the dividend word in AX and fill DX with all 0's. ? DIV BL. Divide word in AX
8086 uses registers CS and IP to access instructions; CS register contains the segment number of the next instruction and the IP contains the offset; The IP is updated each time an instruction is . To clear the sign bit of al while leaving the other bits unchanged, use the and instruction with 01111111b =7Fh as the mask.
21 Sep 2013
otherwise emulator will step through each instruction of a macro. Here is an example .. 0 then jump. Example: include 'emu8086.inc'. ORG 100h. MOV AL, 5. CMP AL, 5. JAE label1. PRINT 'AL is not above or equal to 5'. JMP exit label1: Page 14 of 53. 8086 instructions . Transfers control to another part of the program.

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March 2018