- bugfixes in function redraw_area():   * missing VBE support added, use xmax / ymax variables instead of the     values 640 / 480   * use the constant Y_TILESIZE when checking the y position   * variable vga_mem_updated was always set twice
- bugfixes in function redraw_area():
  * missing VBE support added, use xmax / ymax variables instead of the
    values 640 / 480
  * use the constant Y_TILESIZE when checking the y position
  * variable vga_mem_updated was always set twice

marmolejo/bochs-zet,marmolejo/bochs-zet,marmolejo/bochs-zet,marmolejo/bochs-zet,marmolejo/bochs-zet