Appendix D

List of DOS and BIOS Functions

In this, some of the DOS 21H functions and the BIOS 10H and 16H functions are listed.

i) List of important DOS INT 21H services

DOS system calls use the 21H vector. Some of the important INT 21H services are listed here.

appf07
appf07

ii) BIOS 10H functions for video

1. INT 10H, Function 00: Set Video Mode

Expects: AH = 00

AL = display mode

Returns: None

Description: The function 00 is used to set the video mode. This function clears the screen, sets the BIOS variables and initializes the video mode.

2. INT ...

Get The x86 Microprocessors: 8086 to Pentium, Multicores, Atom and the 8051 Microcontroller, 2nd Edition now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.