Interrupt Handling

This is a discussion on Interrupt Handling within the C Programming forums, part of the General Programming Boards category; Hi, I want to know how to interface with DOS/BIOS interrupts e.g. INT10H,INT21H in VC++6.0 . In older Borland compiler(v2.01) ...

  1. #1
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    Interrupt Handling

    Hi,
    I want to know how to interface with DOS/BIOS interrupts
    e.g. INT10H,INT21H in VC++6.0 .
    In older Borland compiler(v2.01) I know how to interface with
    DOS/BIOS interrupts.e.g. following code was used:
    #include<dos.h>
    main()
    {int ascii,scan;
    union REGS i,o; /*i and o represent unions of type REGS*/
    while(!kbhit());
    i.h.ah=(some int value) /*to give input value*/
    int86(22,&i,&o); /*fn int86 invokes interrupt 22*/
    ascii=o.h.al; /*to get ascii value of key hited*/
    scan=o.h.ah; /*to get scan value*/
    }
    Now same doesn't work in microsoft vc++6.0 or in
    Borland command line 5.5 compiler.Because it doesn't
    recognises REGS unoin.Also when I checked dos.h header file
    I didn't found any REGS whereas in dos.h header file of Borland
    2.01 compiler I found union REGS.
    Can anyone tell what is correct code to interface with DOS/BIOS
    routines in microsoft vc++6.0/borland5.5.Also do I need another
    header file with dos.h. Please clarify.
    Manmohan Singh.

  2. #2
    Code Goddess Prelude's Avatar
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    >Can anyone tell what is correct code to interface with DOS/BIOS routines in microsoft vc++6.0/borland5.5.
    If you're using those two compilers then you aren't running DOS. You're running Windows in 32-bit protected mode with the command prompt that looks a bit like DOS. Chances are very good that you won't be able to compile and run a program designed for true DOS in Windows.
    My best code is written with the delete key.

  3. #3
    Helper
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    Quote Originally Posted by manmohan
    Hi,
    I want to know how to interface with DOS/BIOS interrupts
    e.g. INT10H,INT21H in VC++6.0 .
    You can't do that in Win 32. (Note that it's not a C-question)

    The stategy is completely different. You should learn more about the difference between the real mode and the protected mode on Wintel platforms.
    Emmanuel Delahaye

    "C is a sharp tool"

  4. #4
    Super Moderator VirtualAce's Avatar
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    Actually you can still do that even in XP. I've been messing around with the emulator and it seems like DOS is in there. Although there are several problems - namely it is slower than DOS really was...if you can believe that.

    But so far all interrupts have worked. Check into getting DJGPP from www.delorie.com, but all of the Turbo C++ versions thus far also have worked. I have not tried BC45 and I'm quite sure it does not work since it's startup.asm code relied on being in a DOS environment.

    As well Visual Basic for DOS and QBasic 7.1 and 4.5 also work inside of command under XP. So I take back some of the things I once said about the XP emulator. I truly think now that most of DOS is there and most things will still work in it.

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