home bbs files messages ]

Forums before death by AOL, social media and spammers... "We can't have nice things"

   comp.lang.asm.x86      Ahh, the lost art of x86 assembly      4,675 messages   

[   << oldest   |   < older   |   list   |   newer >   |   newest >>   ]

   Message 3,989 of 4,675   
   R.Wieser to All   
   Re: can't read memory at 0xb8000   
   16 Dec 19 10:17:03   
   
   From: address@nospicedham.not.available   
      
   bilsch01,   
      
   > The problem is that anywhere I place the cursor, hitting the enter key   
   > returns 0x081b regardless where the cursor is on the screen.   
      
   Suggestion: Check if your values are what you expect them to be.   And start   
   with *writing* something to the screen before you subtract 2 from DI.   It   
   will show you if your calculated position is where the cursor is.   
      
   If-and-when that doesn't quite work, display the contents of DX after the   
   "get cursor" call.   After that shows the expected values display the   
   contents of ES:DI. just before reading from screen-memory / subtracting 2   
   from DI   
      
   Remark: The code you posted works here.   
      
   > Maybe the screen buffer is unavailable for reading? Is that possible?   
      
   Ofcourse.  But not likely (never heard of it).   
      
   Regards,   
   Rudy Wieser   
      
   --- SoupGate-Win32 v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)   

[   << oldest   |   < older   |   list   |   newer >   |   newest >>   ]


(c) 1994,  bbs@darkrealms.ca