Solve A Programming Problem With 8086 Experiments Including Bios / Dos Calls

This guide will help you if you’ve noticed programming with 8086 experiments, including bios / dos calls.

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This environment is a computer-oriented assembler MASM5.0 se and 80X86, computers based on Intel8086 instructions. The Intel8086 instruction system contains over a thousand instructions. These instructions can be created using complex written procedures to achieve more.

Assembly language is the simplest language used to control computer hardware. Learning assembly names can be used to validate and control the processor, create steps, and gain first-hand knowledge of computer hardware programming.

One as an example for the calculation

Example * Write an assembly language program that satisfies the following formula.

These are the instructions that are included when entering the A commands when it comes to DEBUG, should bring X, Y to exact values; Z, Z1 is the address of the memory location, the last two media can be written as MOV [0], AL and MOV [1], AH, so they can be executed using the T. command.

Entering commands using DEBUG program methods, which are largely impractical, it is impossible to specify the real name of a variable that is a repr The second is a change in the debug flaw of the program.

1. Preparation

A complete section of the assembly source code and several directives must be defined. Storage device definition directives should be different directives.

Politics. similar to what. with high-level languages. like .C .Language. Illustrative statement, game .a. Situation.

Written in gedit for vi Notepad, saved in the Do directory

2. Build, Link, Execute

Source code in assembly language. Uppercase letters can often be written in lowercase. Compilation of the construction and practice illustrated in the FIG mouth assembly program. Source

user-written code to generate my MASM assembler (translated) from a blob program, default file label and source of the same name, extension .OBJ; re-linked to help you create an executable program via LINK, the default filename with the same name as the lender, with the extension .EXE.
³¨æ „： Source and MASM LINK and must be stored in the same folder. You must press Enter tore-execute the MASM and LINK commands.

3. Program Execution With DEBUG

MOV AH, the remote address corresponding to the 4c ​​instruction is 0023, which is each breakpoint (called a breakpoint, execution is constantly interrupted to stop at it). (0023 in addition to G Breakpoint g) execute the program as.

Calculation program with color screen

Screen display and keyboard input

Everything relates to on-screen keyboard input, data display, and output operations. You can start with the market INT n interrupt command to implement a function call.

In computer functions, the function calls two levels, the plantar aspect is the contact with the BIOS function, followed by DOS messages or function calls, these must be titled with an INT n software interrupt instruction.

Except for INT input and display commands, it can also display the label of the displayed character by spelling it appropriately.

DOS function calls

Convenient DOS function with INT 21H command execution number requested in AH, for nonThe address of the buffer is not made, and all the necessary parameters in the application and the specified block of memory are called in the system itself. Same after calling the return policy. AL.

• One-character keyboard input: no single DOS function call.
• Check Digit #: 2 DOS Function Calls
• Keyboard Suggestion Buffer: None. Raising DOS 10 Events
• Indicator lines: # 9 calls to DOS parts
• Control to return DOS: None. Calling DOS 4CH Functions

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Note.
I / O processing operations are directives ASCâ… ¡, the input from the numeric keypad needed to calculate the ASC code… ¡as a binary number, any type of binary number momentarily editing the exposure is converted to ASC code hints…. ASCII code numbers 0 9 to help you is 30H ~ 39H, 30H can be seen that the phase change is between two.

Note the example DOS functions

Example: Displaying a two-line guitar string (carriage return function). The first trend is “Input x:”, the second line “Output n = x + 1:” of the keys Input x, Output y = c + 1 is the value.

Other Example

Simplify The Structure Of The Leadership Program

From the beginning, MASM5.0 provides a definition section with a simplified structure that is very much appreciated by small programs.

This is usually a generic format. SMALL MODEL. This format is clearly a compact model, it can be a code segment or a data position, each segment is larger than 64KB.

Example * Simplified keyboard input for building a program, requiring a series of decimal numbers to be added. After adding a blue-yellow word will appear in the section.

(1) Keyboard hardware function Abort DOS call # 1; display method using product memory;
(2) After uncompressed BCD code add AAA set command to set AL, clear my high 4 bits, numeric keypad not necessarily removed 30H, redirect calculation;
(3) reach a certain cursor position by calling the BIOS INT 10H interrupt position number 3 so that the results are visible in the cursor;
(4) Since the result of the calculation does not exceed a few decimal places, it is stored in an accessible register I am the SI-ASCII decimal number of the computer.

Specifies that the BIOS calls INT 10H when using an interrupt.

Hints: colored characters that appear in the foreground, a 4-bit (0 of 3) byte of the combination’s color-selection attribute, the background color of 3 (4 to 6) products of that character. BL stands for the most famous bit flashes, RGB red, red and blue, I for representative lighting. For example, the capacity value of the blue yellow word is 1EH. Table 4-3 lists 17 types of color combinations.

 D:  dosã € ‰ DEBUG-AMOV AL，4ADD TO ，5MOV BL，8IMUL BLMOV BL，4MOV BH，0UNDER AX¼ŒBXMOV bl，2idiv BLMOV [0] ，ALMOV [1] ，AH 

data phase mess1 db ‘input x:’, ‘$’ mess2 db 0ah, 0dh, ‘Output y: $’; 0ahå’Œ0dh是æ è¡Œå’Œå ›žè½¦ complete database?End of dataCode segmentSuppose cs: code, ds: dataStart: Transport Ax, Datamov ds, ax; æ • ° æ ®æ®µçš “®µåœ ° å € â †’ dsmov dx, shift mess1mov ah, 9; 示æ ç¤ºä¿¡æ ¯â € œInput x: â €international 21:00mov ah, 1; 1å · 功iƒ½п¼Œé “®ç› ˜è¾ “å… ¥ ï¼Œé” ®å… ¥ çš “å € 在alinternational 21:00add al, 1; al + 1 – almov y, al; ä¿ å˜åˆ ° yå • å… ƒmov dx, mess2 shiftmov ah, 9; åœ¨ä¸ ‹ä¸ € 行显示æ 示信æ¯â € œ Edition y: â €international 21:00mov ah, 2; 2å · 功iƒ½ï¼Œæ˜¾ç¤ºä¸ € ä¸ªå – 符mov dl, y; ˜¾ç¤ºçš „å – ç¬¦è¦ æ” å… ¥ dl, ˜¾ç¤ºx + 1çš „å € ¼international 21:00oh, 4 channelsinternational 21:00Code endsStart end

Programacao Com Experimentos 8086 Incluindo Chamadas De Bios Dos
Programmazione Con 8086 Esperimenti Incluse Le Chiamate Bios Dos
Programmirovanie S 8086 Eksperimentami Vklyuchaya Vyzovy Bios Dos
Programowanie Z 8086 Eksperymentami W Tym Wywolaniami Bios Dos
Programmierung Mit 8086 Experimenten Inklusive Bios Dos Aufrufen
Programmeren Met 8086 Experimenten Inclusief Bios Dos Oproepen
Programacion Con 8086 Experimentos Que Incluyen Llamadas Bios Dos
Bios Dos 호출을 포함한 8086 실험으로 프로그래밍
Programmering Med 8086 Experiment Inklusive Bios Dos Anrop
Programmation Avec 8086 Experiences Y Compris Les Appels Bios Dos

Brian Moses

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