From: Cesar Rabak <csrabak AT uol DOT com DOT br>
Newsgroups: comp.os.msdos.djgpp
Subject: Re: Odp: Turning off monitor ?
Date: Sat, 26 May 2001 12:54:23 -0300
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Rafal Maj wrote:
> 
> :( Tih doesn't work either in DOSbox or in plain DOS :
> 
> #include <dpmi.h>
> #include <dos.h>
> int main() {
>  __dpmi_regs r;
>   r.x.ax = 0x4F10;
>   r.x.bx = 0x01 + 4<<8;
>  __dpmi_int (0x10, &r);
>  // mode: 0=on, 1=standby, 2=suspend, 4=off.
> delay(6000);
> //...
> }
> 

Why didn't you check the result in AL (r.x.al) and AH (r.x.ah)?

Also, what is the return of a call with BL (r.x.bl) zeroed?