The string must be terminated with the character $ (24H), which is not transmitted. Any other ASCII codes, including control codes, can be embedded in the string.[1] Sends a string of characters to the display.
[2.0+] Sends a string of characters to the standard output device. Output may be redirected. (If output has been redirected, there is no way to detect disk full.)
Call with:
AH = 09H
DS:DX = segment:offset of string
Returns:
Nothing
Notes:
The string must be terminated with the character $ (24H), which is not transmitted. Any other ASCII codes, including control codes, can be embedded in the string.
See Int 21H Functions 02H and 06H for single-character output to the video display or standard output device.
If a Ctrl-C is detected at the keyboard, an Int 23H is executed.
[2.0+] You can also send strings to the display by performing a write (Int 21H Function 40H) using the predefined handle for the standard output (0001H), if it has not been redirected, or a handle obtained by opening the logical device CON.
Example:
Send the string Hello World, followed by a carriage return and line feed, to the standard output device.
cr equ 0dh
lf equ 0ah
msg db 'Hello World',cr,lf,'$'
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mov ah,9 ; function number
mov dx,seg msg ; address of string
mov ds,dx
mov dx,offset msg
int 21h ; transfer to MS-DOS
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