 format PE console
entry start

section '.data' data readable writeable
    msg_devices db 'Информация об установленных устройствах:', 0
    msg_com_ports db 'Базовые адреса портов (COM и LPT):', 0
    msg_memory_size db 'Размер стандартной памяти:', 0
    msg_video_mode db 'Текущий активный видеорежим:', 0
    msg_screen_width db 'Ширина экрана (число колонок символов):', 0
    msg_video_memory_size db 'Размер зоны видеопамяти, используемой:', 0
    msg_active_page db 'Номер активной видеостраницы:', 0
    msg_ctrl_break_flag db 'Флаг ctrl+break:', 0
    newline db 13, 10, 0

section '.code' code readable executable
start:
    mov ax, 0x0400
    mov ds, ax

    ; Вывод информации об установленных устройствах
    mov ah, 9
    mov dx, msg_devices
    int 21h

    ; Вывод базовых адресов портов (COM и LPT)
    mov dx, msg_com_ports
    int 21h
    mov si, 0x0000
    mov cx, 0x00E0
    call print_data

    ; Вывод размера стандартной памяти
    mov dx, msg_memory_size
    int 21h
    mov si, 0x0013
    mov cx, 2
    call print_data

    ; Вывод текущего активного видеорежима
    mov dx, msg_video_mode
    int 21h
    mov si, 0x0049
    mov cx, 1
    call print_data

    ; Вывод ширины экрана
    mov dx, msg_screen_width
    int 21h
    mov si, 0x004A
    mov cx, 1
    call print_data

    ; Вывод размера зоны видеопамяти
    mov dx, msg_video_memory_size
    int 21h
    mov si, 0x004C
    mov cx, 2
    call print_data

    ; Вывод номера активной видеостраницы
    mov dx, msg_active_page
    int 21h
    mov si, 0x0062
    mov cx, 1
    call print_data

    ; Вывод флага ctrl+break
    mov dx, msg_ctrl_break_flag
    int 21h
    mov si, 0x0071
    mov cx, 1
    call print_data

    ; Завершение программы
    mov ah, 4Ch
    xor al, al
    int 21h

print_data:
    mov bx, 10 ; Делитель для перевода значения в десятичную систему
print_loop:
    xor dx, dx
    div bx    ; Деление AX на BX, остаток в DX
    add dl, '0' ; Преобразование остатка в символ
    push dx   ; Сохранение символа в стеке
    test ax, ax
    jnz print_loop ; Повторяем, пока в AX есть значение
print_loop_end:
    pop dx    ; Извлечение символа из стека
    mov ah, 02h
    int 21h   ; Вывод символа
    loop print_loop_end ; Повторяем, пока есть символы в стеке
    ret

section '.idata' import data readable
    library kernel32, 'KERNEL32.DLL',\
            msvcrt, 'MSVCRT.DLL'

    import kernel32,\
           ExitProcess, 'ExitProcess'

    import msvcrt,\
           printf, 'printf'

section '.reloc' fixups data discardable

created 2 years ago

Assembly Online Compiler

Write, Run & Share Assembly code online using OneCompiler's Assembly online compiler for free. It's one of the robust, feature-rich online compilers for Assembly language. Getting started with the OneCompiler's Assembly compiler is simple and pretty fast. The editor shows sample boilerplate code when you choose language as Assembly and start coding.

About Assembly

Assembly language(asm) is a low-level programming language, where the language instructions will be more similar to machine code instructions.

Every assembler may have it's own assembly language designed for a specific computers or an operating system.

Assembly language requires less execution time and memory. It is more helful for direct hardware manipulation, real-time critical applications. It is used in device drivers, low-level embedded systems etc.

Syntax help

Assembly language usually consists of three sections,

Data section

To initialize variables and constants, buffer size these values doesn't change at runtime.
bss section

To declare variables
text section

_start specifies the starting of this section where the actually code is written.

Variables

There are various define directives to allocate space for variables for both initialized and uninitialized data.

1. To allocate storage space to Initialized data

Syntax

variable-name    define-directive    initial-value

Define Directive	Description	Allocated Space
DB	Define Byte	1 byte
DW	Define Word	2 bytes
DD	Define Doubleword	4 bytes
DQ	Define Quadword	8 bytes
DT	Define Ten Bytes	10 bytes

2. To allocate storage space to un-initialized data

Define Directive	Description
RESB	Reserve a Byte
RESW	Reserve a Word
RESD	Reserve a Doubleword
RESQ	Reserve a Quadword
REST	Reserve a Ten Bytes

Constants

Constants can be defined using

1. equ

To define numeric constants

CONSTANT_NAME EQU regular-exp or value

2. %assign

To define numeric constants.

%assign constant_name value

3. %define

To define numeric or string constants.

%define constant_name value

Loops

Loops are used to iterate a set of statements for a specific number of times.

mov ECX,n
L1:
;<loop body>
loop L1

where n specifies the no of times loops should iterate.

Procedures

Procedure is a sub-routine which contains set of statements. Usually procedures are written when multiple calls are required to same set of statements which increases re-usuability and modularity.

procedure_name:
   ;procedure body
   ret