interupt 21 dl=10

flat assembler
Message board for the users of flat assembler.

Index > DOS > interupt 21 dl=10

Author

Thread

This topic is locked: you cannot edit posts or make replies.

xddxogm3

Joined: 09 Nov 2005
Posts: 12

xddxogm3 12 Nov 2005, 03:22

display character of 10h = "data link escape"
what does data link escape do?
i found it in a snippin of code that creates a carriage return.

12 Nov 2005, 03:22

vbVeryBeginner

Joined: 15 Aug 2004
Posts: 884
Location: \\world\asia\malaysia

vbVeryBeginner 12 Nov 2005, 07:43

what ah function are you using?

12 Nov 2005, 07:43

xddxogm3

Joined: 09 Nov 2005
Posts: 12

xddxogm3 12 Nov 2005, 20:20

Code:

mov ah, 2

this is a excerpt from a carriage return module.
you print out two ascii characters first the carriage return, then the data link escape

full code of module

Code:

CRLF:
        push    ax 
        push    dx

        mov     ah,2    ;assign 2 to ah register (output character)
        mov     dl,13   ;print carriage return
        int     21h     ;doit
        mov     dl,10   ;print data link escape
        int     21h     ;doit

        pop     dx 
        pop     ax 

ret

[/code]

12 Nov 2005, 20:20

Matrix

Joined: 04 Sep 2004
Posts: 1166
Location: Overflow

Matrix 21 Nov 2005, 15:56

this is a print char function,
dl means the code of the byte to be put to screen at cursor position,

13 = $0d this means carrige return - CR, moves to beginning of line

10= $0a this is line feed - LF, moves 1 line down

21 Nov 2005, 15:56

< Last Thread | Next Thread >

Forum Rules:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum