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rawSun

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Some
common DOS functions & interrupts used in 8086






INT 21H


Functions (Content of AH)

Description

00

Terminate the program, we can also use
function 4CH instead

01

Read a character from the standard
input device. The character read is returned to AL and echoed

02

Send a character contained in DL to
the standard output device.

05

Send a character in Dl to the parallel
printer port.

07

Read a character from standard input
device. The character is returned to AL but not echoed.

09

Sends a string of characters to the
standard output device. DX contains the offset address of string must be
terminated by ‘$’

0Ah

Reads a string from the user until the
user presses . DX points to the location whose 1st
byte gives the maximum characters allowed to enter and the byte next stores
the actual no of characters entered and the rest space stores the characters
entered.

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tihor

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Thank you very much.

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