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Assembly 8086: Check if a key is pressed to exit a program

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  • 12-01-2011 5:12pm
    #1
    Stev_o
    Registered Users Posts: 9,249 ✭✭✭


    Hi all.

    This is one problem that has literally plagued me and i can't see to get a answer for it.

    In my program i wish to do a simple loop function.

    Draw a box that incerements and decrements up and down the screen.

    However when a button is pressed i want the program to exit.

    My problem is that i don't want the program to hang when i use INT21 Check Keyboard status as the loop won't continue the interrupt requires input to exit.

    How do i get past this? I need to be constantly checking if their is input but do not wish my initial action loop to stop as a result of it.

    Any help would be great.


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    #2
    dazberry
    Registered Users Posts: 2,150 ✭✭✭dazberry


    Check out Int 16h, AFAIR you can poll the keyboard state to see if a character is there...

    mov ah,01
    int 16h
    jz ...

    D.


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