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Internet Message Format  |  1996-08-05  |  1.1 KB
  1. Path: grimsel.zurich.ibm.com!usenet
  2. From: Keith Whittingham <wgk@zurich.ibm.com>
  3. Newsgroups: comp.lang.c
  4. Subject: Re: How can you make this work?
  5. Date: Sun, 14 Apr 1996 19:07:05 -0700
  6. Organization: IBM Zurich Research Laboratory
  7. Message-ID: <3171AF49.47D@zurich.ibm.com>
  8. References: <4kr886$13t@hermes.oanet.com>
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  14.  
  15. scorpion@portal.connect.ab.ca wrote:
  16. > 
  17. >         I need to know why this gives an 'Illegal Pointer
  18. > Arithmetic' error ; It's supposed to be a pixel write routine:
  19. > 
  20. > void putpixel(short x,short y,unsigned char colour)
  21. > {       char far *Startofvidmem;
  22. >         char far *Location; /* Address of where to write the
  23. > pixel*/
  24. >         Startofvidmem = 0xA000;
  25. > 
  26. >         Location = Startofvidmem + (y*320) + x;
  27. >         *Location = colour;
  28. > }
  29. > 
  30. >         Thanx in advance!
  31. > John Smith
  32.  
  33. It should work but I would stick a few more zero's in the address
  34. of the video buffer if you're working on a PC...
  35.  
  36. Try 0xA0000000.
  37.  
  38.  
  39. -- 
  40. Keith Whittingham
  41. wgk@zurich.ibm.com
  42.