From: dontmailme AT iname DOT com (Steamer)
Newsgroups: comp.os.msdos.djgpp
Subject: Re: MASM coff images
Date: Sun, 28 May 2000 09:52:33 GMT
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Dogansmoobs wrote:

>Ok, this is the only asm file that I have tried this with.  I am
>on a different computer than the one I program on, so if there
>are any mistakes,

(Yes - the first three lines of VGA.ASM should start with a dot.)

>it's not there in the actual code.  The code
>compiles fine, with no errors or warnings.
>
>VGA.ASM:::::::::::::::::::::::
>486
>MODEL MEDIUM,C

As I said before, you can't do this.  You need a flat memory model.
In particular, medium model code uses far returns, but you need
near returns.

>CODE
>
>PUBLIC _setVga  ;I have tried this with and without the undescore

The underscore is necessary.

>_setVga PROC C
>  mov ah, 0
>  mov al, 13
>  int 10
>  ret
>_setVga ENDP
>
>PUBLIC _setText
>_setText PROC C
>  mov ah, 0
>  mov al, 3
>  int 10
>  ret
>_setText ENDP

You can't call real-mode BIOS interrupts directly from 32-bit protected
mode and expect it work.  (You can do it via DPMI though - see the FAQ.)

>END

>And the C file that I have tried to link it with is like so:

The C code looked OK (except that I think you need to use textprintf
instead of printf to print to a graphics screen).

>gcc vgatest.c vga.obj -Wall -g -o vgatest.exe

Probably you need to rename vga.obj to vga.o, as I'm not sure that
gcc recognises .obj as an object file extension.

S.