The 640 MEG Shareware Studio 4

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Graphics Interchange Format | 1993-08-28 | 9KB | 640x480 | 4-bit (9 colors)

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OCR: Memory organization in BIOS Mode 13h (320x200x256), version 1.0 012 3456. . 319 This is how the screen to the left is represented in the VGA video Memory. X Means unused/ inaccessible . Plane 3 This is what is shown 3 319 on the screen 1 2 3 4 5 318 319 Plane 2 2 318 0 1 2 3 4 5 318 319 As you can see, a bit plane is selected by the Plane 1 2 least significant bits of the address, 1 5 automatically . 2 3 5 318 319 This renders 3/4 of the available video Plane 0 Memory unusable, but provides for 4 extremely 2 4 5 318 319 simple and efficient addressing of individual address (offset in video segment) pixels . . . <C) 1993 Robert Schmidt