Labels:text | screenshot | font | number | diagram | line OCR: Memory organization in unchained 256-color Modes (as Mode X) , version 1.0 012 3456. . 319 This is how the screen to the left is represented in the VGA video Memory. Plane 3 This is what is shown 3 7 11 15 19 23 315 319 on the screen 2 3 4 5 78 79 Plane 2 2 6 10 14 18 22 314 318 3 4 5 78 79 When writing to one address you can select 1-4 bit Plane - planes to receive the data, by setting the Write Plane Enable 1 5 9 13 17 21 313 317 register . 1 2 3 4 5 78 79 When reading, select one of the four planes Plane 0 by setting the 4 16 20 Read Plane 8 12 312 316 - Select register . 2 4 5 78 79 As each offset addresses four pixels, you have address (offset in video segment) 4x64Kb=256Kb available video Memory. In a 320x200 Mode, this Means a little More than four full pages! Use the Start Address registers to select pages or perform scrolling . <C) 1993 Robert Schmidt
