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[16.git] / 16 / intro / M13ORG.ASC

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-Figure 1: Memory organization in mode 13h (ASCII version)\r
-         by Robert Schmidt\r
-          (C) 1993 Ztiff Zox Softwear\r
-\r
-a. Imagine that the top of the screen looks like this (pixel values are\r
-   represented by color digits 0-9 for simplicity - actual colors may\r
-   range from 0 to 255) - a screen width of 320 pixels is assumed:\r
-\r
-    address:  0         10                310      319\r
-             ----------------------------------------\r
-             |0123456789012345    .....   0123456789|\r
-             |                                      |\r
-             |                                      |\r
-             |\r
-\r
-b. In VGA memory, the screen is represented as follows (question marks\r
-   represent unused bytes):\r
-\r
-   Plane 0:\r
-\r
-    address:  0         10                310      319\r
-             ----------------------------------------\r
-             |0???4???8???2???    .....   ??2???6???|\r
-             |                                      |\r
-             |                                      |\r
-\r
-   Plane 1:\r
-\r
-    address:  0         10                310      319\r
-             ----------------------------------------\r
-             |?1???5???9???3??    .....   ???3???7??|\r
-             |                                      |\r
-             |                                      |\r
-\r
-   Plane 2:\r
-\r
-    address:  0         10                310      319\r
-             ----------------------------------------\r
-             |??2???6???0???4?    .....   0???4???8?|\r
-             |                                      |\r
-             |                                      |\r
-\r
-   Plane 3:\r
-\r
-    address:  0         10                310      319\r
-             ----------------------------------------\r
-             |???3???7???1???5    .....   ?1???5???9|\r
-             |                                      |\r
-             |                                      |\r
-\r
-   I.e. a plane is selected automatically by the two least significant\r
-   bits of the address of the byte being read from or written two.\r
-   This renders 3/4 of the video memory unavailable and useless, but\r
-   all visible pixels are easily accessed, as each address in the video\r
-   segment provides access to one and ONLY ONE pixel.\r