So we will use 8086 processor that was used when the computer industry started. I think the computer of the beginning is the best to learn the language of the beginning. Current computers are too complex for us to start the language of the beginning. Introduction to the emu8086 program.
Use Emu8086 Code On EMU8086
I’ve never used EMU8086, and don’t intend to. I just know you’re running this code on EMU8086. After all, why would you preserve the lower half of AX, while trashing other registers I don’t know what assembler you’re using.
Several arithmetic and logic operations.Everything for learning assembly language in one pack! Emu8086 combines an advanced source editor, assembler, disassembler, software emulator (Virtual PC) with debugger, and step by step tutorials.This program is extremely helpful for those who just begin to study assembly language. The calculator were designed over the virtual machine for Intel 8086 microprocessor using EMU8086 emulator software. Start Emu8086 by selecting its icon from the.
Start Emu8086 by selecting its icon from the start menu, or by running Emu8086.exe.3. 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 Emu8086 to compile the code, you won't be able to step through your actual source code while running it.1. This makes 8086 code very portable, since it runs both on ancient and on the modern computer systems. You can watch registers, flags and memory while your program executes.Arithmetic & Logical Unit (ALU) shows the internal work of the central processor unit (CPU).Emulator runs programs on a Virtual PC, this completely blocks your program from accessing real hardware, such as hard-drives and memory, since your assembly code runs on a virtual machine, this makes debugging much easier.8086 machine code is fully compatible with all next generations of Intel's micro-processors, including Pentium II and Pentium 4, I'm sure Pentium 5 will support 8086 as well.
MOV CL, 3 PRINTN 'Welcome!' macro. Here is an example that uses PRINTN macro:#make_COM# include 'emu8086.inc' ORG 100h MOV AL, 1 MOV BL, 2 PRINTN 'Hello World!' macro. For example:L Some examples contain macros, so it is advisable to use Shift + F8 hot key to Step Over (to make macro code execute at maximum speed set step delay to zero), otherwise emulator will step through each instruction of a macro. For example:L Some instructions allow several operand combinations.
4-byte address may be entered in this form: 1234h:5678h, first value is a segment second value is an offset (this is a far call, so CS is also pushed to stack). Result is stored in operand1.1 AND 1 = 11 AND 0 = 00 AND 1 = 00 AND 0 = 0MOV AL, 'a' AL = 01100001bAND AL, 11011111b AL = 01000001b ('A')RETTransfers control to procedure, return address is (IP) is pushed to stack. This is especially important for Conditional Jump instructions (see "Program Flow Control" in Tutorials for more information).ASCII Adjust after Addition.Corrects result in AH and AL after addition when working with BCD values.It works according to the following Algorithm:L AL = AL + 6l AH = AH + 1l AF = 1l CF = 1In both cases:clear the high nibble of AL.MOV AX, 15 AH = 00, AL = 0FhAAA AH = 01, AL = 05RETFile:///D|/Heep/Assem/SW/Emu8086v3.07/Help/8086_instruction_set.html (3 of 73) 12:16:29ASCII Adjust before Division.Prepares two BCD values for division.MOV AX, 0105h AH = 01, AL = 05AAD AH = 00, AL = 0Fh (15)RETASCII Adjust after Multiplication.Corrects the result of multiplication of two BCD values.MOV AL, 15 AL = 0FhAAM AH = 01, AL = 05RETFile:///D|/Heep/Assem/SW/Emu8086v3.07/Help/8086_instruction_set.html (4 of 73) 12:16:29ASCII Adjust after Subtraction.Corrects result in AH and AL after subtraction when working with BCD values.L AL = AL - 6l AH = AH - 1l AF = 1l CF = 1MOV AX, 02FFh AH = 02, AL = 0FFhAAS AH = 01, AL = 09RETFile:///D|/Heep/Assem/SW/Emu8086v3.07/Help/8086_instruction_set.html (5 of 73) 12:16:29REG, memorymemory, REGREG, REGmemory, immediateREG, immediateSTC set CF = 1MOV AL, 5 AL = 5ADC AL, 1 AL = 7RETFile:///D|/Heep/Assem/SW/Emu8086v3.07/Help/8086_instruction_set.html (6 of 73) 12:16:29Logical AND between all bits of two operands.
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