1vga_getgraphmem(3)            Svgalib User Manual           vga_getgraphmem(3)
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NAME

6       vga_getgraphmem - returns the address of the VGA memory
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SYNOPSIS

9       #include <vga.h>
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11       unsigned char *graph_mem; /* This declaration is already in vga.h */
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13       unsigned char *vga_getgraphmem(void);
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DESCRIPTION

17       returns  a pointer to the 64K VGA frame buffer window.  vga_setpage(3),
18       vga_setreadpage(3) and vga_setwritepage(3) allow to select  which  page
19       of  the  VGA  memory  shows up at this position.  vga_setlinearaddress‐
20       ing(3) maps all VGA memory at a consecutive memory area (if  the  hard‐
21       ware  supports  it).   In  this mode, vga_getgraphmem() will return the
22       location of this area too. You can  also  access  the  global  variable
23       graph_mem, which will also contain this address.
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25       Most  demos,  esp.  vgatest(6) show the simple direct use of this func‐
26       tion to access screen memory.
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SEE ALSO

30       svgalib(7), vgatest(6),  fun(6),  testlinear(6),  vga_setlinearaddress‐
31       ing(3),  vga_claimvideomemory(3),  vga_getmodeinfo(3),  vga_setpage(3),
32       vga_setreadpage(3), vga_setwritepage(3),
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AUTHOR

36       This manual page was edited  by  Michael  Weller  <eowmob@exp-math.uni-
37       essen.de>.  The  exact  source of the referenced function as well as of
38       the original documentation is unknown.
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40       It is very likely that both are at least to some extent are due to Harm
41       Hanemaayer <H.Hanemaayer@inter.nl.net>.
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43       Occasionally  this  might be wrong. I hereby asked to be excused by the
44       original author and will happily accept any additions or corrections to
45       this first version of the svgalib manual.
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49Svgalib (>= 1.2.11)              27 July 1997               vga_getgraphmem(3)