X-Git-Url: http://4ch.mooo.com/gitweb/?a=blobdiff_plain;f=16%2Ftweak16%2FXINTRO%2FM13ORG.ASC;fp=16%2Ftweak16%2FXINTRO%2FM13ORG.ASC;h=0000000000000000000000000000000000000000;hb=4b23f27092a9470a741e3a18261ad389fd1929db;hp=906ec42ca66411cc86e66b9f266989a8045fc1cc;hpb=5d8d1deb6c3520abadbad86d202ea453df77bfc2;p=16.git

diff --git a/16/tweak16/XINTRO/M13ORG.ASC b/16/tweak16/XINTRO/M13ORG.ASC
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-Figure 1: Memory organization in mode 13h (ASCII version)
-	  by Robert Schmidt
-          (C) 1993 Ztiff Zox Softwear
-
-a. Imagine that the top of the screen looks like this (pixel values are
-   represented by color digits 0-9 for simplicity - actual colors may
-   range from 0 to 255) - a screen width of 320 pixels is assumed:
-
-    address:  0         10                310      319
-             ----------------------------------------
-             |0123456789012345    .....   0123456789|
-             |                                      |
-             |                                      |
-             |
-
-b. In VGA memory, the screen is represented as follows (question marks
-   represent unused bytes):
-
-   Plane 0:
-
-    address:  0         10                310      319
-             ----------------------------------------
-             |0???4???8???2???    .....   ??2???6???|
-             |                                      |
-             |                                      |
-
-   Plane 1:
-
-    address:  0         10                310      319
-             ----------------------------------------
-             |?1???5???9???3??    .....   ???3???7??|
-             |                                      |
-             |                                      |
-
-   Plane 2:
-
-    address:  0         10                310      319
-             ----------------------------------------
-             |??2???6???0???4?    .....   0???4???8?|
-             |                                      |
-             |                                      |
-
-   Plane 3:
-
-    address:  0         10                310      319
-             ----------------------------------------
-             |???3???7???1???5    .....   ?1???5???9|
-             |                                      |
-             |                                      |
-
-   I.e. a plane is selected automatically by the two least significant
-   bits of the address of the byte being read from or written two.
-   This renders 3/4 of the video memory unavailable and useless, but
-   all visible pixels are easily accessed, as each address in the video
-   segment provides access to one and ONLY ONE pixel.