trusty (3) graph_mem.3.gz

NAME

       vga_getgraphmem - returns the address of the VGA memory

SYNOPSIS

       #include <vga.h>

       unsigned char *graph_mem; /* This declaration is already in vga.h */

       unsigned char *vga_getgraphmem(void);

DESCRIPTION

       returns  a  pointer  to  the  64K  VGA  frame  buffer  window.   vga_setpage(3),  vga_setreadpage(3)  and
       vga_setwritepage(3)  allow  to  select  which  page  of  the  VGA  memory  shows  up  at  this  position.
       vga_setlinearaddressing(3)  maps  all  VGA  memory at a consecutive memory area (if the hardware supports
       it).  In this mode, vga_getgraphmem() will return the location of this area too. You can also access  the
       global variable graph_mem, which will also contain this address.

       Most demos, esp.  vgatest(6) show the simple direct use of this function to access screen memory.

SEE ALSO

       svgalib(7),   vgatest(6),  fun(6),  testlinear(6),  vga_setlinearaddressing(3),  vga_claimvideomemory(3),
       vga_getmodeinfo(3), vga_setpage(3), vga_setreadpage(3), vga_setwritepage(3),

AUTHOR

       This manual page was edited by Michael Weller <eowmob@exp-math.uni-essen.de>. The  exact  source  of  the
       referenced function as well as of the original documentation is unknown.

       It   is   very   likely   that   both   are   at  least  to  some  extent  are  due  to  Harm  Hanemaayer
       <H.Hanemaayer@inter.nl.net>.

       Occasionally this might be wrong. I hereby asked to be excused by the original author  and  will  happily
       accept any additions or corrections to this first version of the svgalib manual.