From: alexfrunews@nospicedham.gmail.com   
      
   On Wednesday, April 4, 2018 at 5:59:27 PM UTC-7, bilsch wrote:   
   > My simple OS uses int 0x10 to display o/p. I'm adding a routine (txt)   
   > that is a simple text editor which writes to memory at segment 0xb800. I   
   > enter/exit the txt routine using call/ret.  Once I have filled the   
   > screen with text using the txt routine and then ret back to the OS loop   
   > subsequent int 0x10 o/p  does not get shown on the screen.  Even when   
   > the cursor is repositioned to row/col 0/0.  How do I get int 0x10   
   > display capability back after filling the screen using memory at 0xb800?   
   > TIA.  Bill S.   
      
   Are you sure you aren't trying to display e.g. black   
   letters on black background?   
      
   Alex   
      
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