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Subject: Re: NTVDM Error and TVision.
Date: Thu, 3 Jan 2002 22:53:30 +1100
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Reply-To: djgpp-workers AT delorie DOT com

I traced it further and found that the NTVDM error occurs in the int 0x10
call fail when run under Win XP in a window. The offending function is
rh_restore_vga_state() in the vga.cc file. This function is called
from....from..... via... and finally the TSsreen destructor.

void rh_restore_vga_state()
{
 if (useBIOS_VGA_State)
   {// SET: It fails for some Matrox boards.
    __dpmi_regs r;
    if (vga_state_segment == -1)
        return;
    r.x.ax = 0x1c02;
    r.x.es = vga_state_segment;
    r.x.bx = 0;
    r.x.cx = 0x0007;
    __dpmi_int(0x10,&r);
   }
 else
 {
    VGAStateLoad(vgaState);
    }
}

If I force the code to use the VGAStateLoad() function then it works fine
(TV example and seteditor).

Could I get some feedback from people on with regards to the following as
the problem could be that my video card (Nvida MX (original, not 200 or
400)) could have a stuffed bios that causes a problem with the NTVDM:-
1) Could someone download the seteditor and run it with and without the -S
option in a window mode and see if it works.  The -S option forces
useBIOS_VGA_State = 0, no -S option sets it to 1.
2) Could someone download the seteditor and run it under 2K or XP with a non
Nvidia video card or non MX video card. This may confirm if it is video bios
related or just 2K and XP releated.

I tried the code on Win 98 with a TNT 2 and it worked fine. I can run
seteditor without it causing any NTVDM errors if I run it with the -S
option.

A possible solutions could be to always set useBIOS_VGA_State to 0 under NT.

By the way even with useBIOS_VGA_State = 0 I still get a NTVDM error in
Rhide, one issue found now to move onto the next one. More debugging to be
done.