From: jj4public@nospicedham.outlook.com   
      
   On Tue, 13 Feb 2024 08:57:32 +0100, R.Wieser wrote:   
   > Hello all,   
   >   
   > I've got a small program going thru all video-modi by looping AL from 80   
   > upto FF, calling INT 10, AH=00.   
   >   
   > I would like to find out which of those modi are graphical.  Ralf Browns   
   > memory list shows 0040:0065 to hold some bits regarding the current video   
   > mode.  In my case the lower two bits are of interrest   
   >   
   > Mode 03, text, shows the value 01.  Alas, mode 0D, graphics, also shows 01.   
   > In fact, only modi 4 thru 6 show a 02 there, and modi 0 and 01 show a 00.   
   > Al others show 01.   
   >   
   > And I'm pretty sure there are  few other graphics modi above mode 06 ...   
   >   
   > tl;dr:   
   > How do I find out if a certain mode is graphics ?   
      
   Easy way: Use BIOS service to read a pixel. It's only applicable in graphic   
   video mode.   
      
   Hard way: Use the video ports to check the current type of video mode. i.e.   
   graphic or text.   
      
   > Secondary question : if the lower two bits of 0040:0065 are *not* the   
   > current video-modes graphics and textmode capablities, what do they signify   
   > instead ?   
      
   See Ralf Brown's Interrupt List.   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)