vga gl_setdisplaystart(int x, int y);
Can be used for hardware scrolling, or for page flipping (e.g. setdisplaystart(0, HEIGHT) displays from the second page). Make sure the scanline width (BYTEWIDTH) in bytes of the current context corresponds with the physical screen.
Note also that the display start cannot be set to completely arbitrary points, see vga_setdisplaystart(3).
This manual page was edited by Michael Weller <email@example.com>. The exact source of the referenced demo 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.