INT 21h functions 01 and 07 are used to read a character from the keyboard with and without echo to the screen. Saves CS:IP and the flags on the stack and goes to the subroutine associated with that interrupt. g. COA Experiment 9 - Free download as PDF File (. One interesting software interrupt to map or chain is Int 0x1C (or 0x08 if you are careful), which is the system tick interrupt, called 18. In x86 processors, 256 interrupts, numbered 00 to FF. This s Apr 23, 2025 · 8086 | INT 21H DOS Interrupt | Important for Assembly Language Practicals | Bharat Acharya Education Bharat Acharya Education - Unacademy 228K subscribers 0 int 21h int 21h 162636 Dec 23, 2004 · 이웃추가 본문 기타 기능 [어셈블러] 인터럽트 호출 int 21h MS-DOS 기능 번호 기능 번호 01H : 키보드 입력 기능 : 표준 입력장치 (키보드)로부터 데이터를 입력받는다. - Table of Interrupts ; hide blinking text cursor: mov ch, 32 mov ah, 1 int 10h ; show standard blinking text cursor: mov ch, 6 mov cl, 7 mov ah, 1 int 10h ; show box-shaped blinking text cursor: mov ch, 0 mov cl, 7 mov ah, 1 int 10h ; note: some bioses required CL to be >=7,; otherwise wrong cursor shapes are displayed. INT 21h Function 0Ah: Read buffered array from standard input Requires a predefined structure to be set up that describes the maximum input size and holds the input characters. Sep 12, 2018 · The information needed by Function 12h is destroyed by any operation on the file using the FCB created via Function 11h. Oct 21, 2012 · It is possible to remap Int 0x21 and other software interrupts (even inside DOS though this can have negative side effects). Within this range some calls have subfunctions which further extend the range of operations. INT 13h / AH = 00h - reset disk system. Jan 15, 2026 · Explore the thrilling world of motorsport at the Bathurst 12 Hour - Australia's premier endurance race. Key Difference: INT 3h is a 1-byte instruction (CC), while INT 21h requires function numbers in AH to specify system calls. 0: INT 10H and 21H The INT instruction is somewhat like a FAR call. Int 21h functions The following includes most MS-DOS INT 21H functions related to simple file anc console I/O, as well as a few functions related to system date and time. How it Feb 28, 2024 · 通过具体的指令示例，如MOVAH,01H用于键盘输入，MOVAH,02H用于显示输出，以及MOVAH,09H用于显示字符串等，阐述了如何利用INT21H进行各种基本的输入输出操作。 INT 21H一般搭配着AH使用。 The interrupt number is specified as the parameter of the software interrupt instruction (in Intel assembly language, an "INT" instruction), and the function number is specified in the AH register; that is, the caller sets the AH register to the number of the desired function. INT 13h is shorthand for BIOS interrupt call 13 hex, the 20th interrupt vector in an x86 -based (IBM PC-descended) computer system. 3) files. 4. By calling INT 21h with a subfunction number in the AH processor register and other parameters in other registers, various DOS services can be invoked. In all calls, on entry AH defines the function. com te If the executable was a . Feb 13, 2021 · Int 21h is a dos interrupt. data msg dd 'This will be Interrupciones de software Interrupciones mas usuales: Int 21H (interrupción del DOS) Int 10H (interrupción del BIOS) Int 16H (Interrupción del BIOS) Int 17H (Interrupción del BIOS) Interrupciones internas de hardware Las interrupciones internas son generadas por ciertos eventos que surgen durante la ejecución de un programa. txt) or read online for free. Aug 6, 2013 · I want to get memory size in assembly with int 12, but when I call this interrupt it only gives 639. Apr 4, 2019 · 中断描述 INT 00h CPU：除零错，或商不合法时触发 INT 01h CPU：单步陷阱，TF标记为打开状态时，每条指令执行后触发 INT 02h CPU：非可屏蔽中断，如引导自我测试时发生内存错误。 INT 03h CPU：第一个未定义的中断向量，约定俗成仅用于调试程序 INT 04h CPU The 12 Hours of Sebring is an annual motorsport endurance race for sports cars held at Sebring International Raceway, on the site of the former Hendricks Army Airfield World War II air base in Sebring, Florida, United States. 2. Thus, Dec 12, 2011 · 很多初学汇编语言的同学可能会对INT 21H这条指令感到困惑，不知道是什么意思，下面就以一段简单的程序为大家讲解：例如：需要键盘输入，并且回显。AH的值需要查表取得，表在下面指令：MOV AH,01INT 21H通过这样两条指令，输入的字符就会被存储在AL中。表：DOS系统功能调INT 21HAH功 Interruption 21h: Service d'interruption DOS (DOS API) : Cette interruption offre un regroupement de tous les services offert par le système d'exploitation DOS ou compatible. JetPhotos. It provides examples of using several DOS interrupt functions: 1.

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