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x68000:video_ram_basics [2017/08/14 08:14] – neko68kx68000:video_ram_basics [2019/08/27 20:45] (current) – external edit 127.0.0.1
Line 16: Line 16:
  BIT = 〃 bit position  BIT = 〃 bit position
  
----- +**Real screen 512×512 pixels、65536 color display**
- +
- +
-== Real screen 512×512 pixels、65536 color display ==+
 | Valid bits  | Full 16 bits             | | Valid bits  | Full 16 bits             |
 | 1 Row       | 1024 bytes(512 words)  | | 1 Row       | 1024 bytes(512 words)  |
 | Page 0      | $c00000～$c7ffff        | | Page 0      | $c00000～$c7ffff        |
  
-== Real screen 512×512 pixels、256 color display: ==+**Real screen 512×512 pixels、256 color display:**
 |Valid bits|Lower 8 bits| |Valid bits|Lower 8 bits|
 |1 Row|1024 bytes(512 words)| |1 Row|1024 bytes(512 words)|
Line 31: Line 28:
  
  ADR = $c00000＋Y×1024＋X×2  ADR = $c00000＋Y×1024＋X×2
- BIT = P×8 ～ P×8＋7 of 8 bits+ BIT = P×8 ～ P×8＋7 for 8 bits
  
-== Real screen 512×512 pixels、16 colors ==+**Real screen 512×512 pixels、16 colors**
 |Valid bits|Lower 4 bits| |Valid bits|Lower 4 bits|
 |1 Row|1024 bytes(512 words)| |1 Row|1024 bytes(512 words)|
Line 42: Line 39:
  
  ADR = $c00000＋Y×1024＋X×2  ADR = $c00000＋Y×1024＋X×2
- BIT = P×4 ～ P×4＋3 of 4 bits+ BIT = P×4 ～ P×4＋3 for 4 bits
  
-== Real screen 1024×1024 pixels、16 colors: ==+**Real screen 1024×1024 pixels、16 colors:**
 |Valid bits|Lower 4 bits| |Valid bits|Lower 4 bits|
 |1 Row|2048 bytes(1024 words)| |1 Row|2048 bytes(1024 words)|
Line 51: Line 48:
  ADR = $c00000＋(Y＆511)×1024＋(X＆511)×2  ADR = $c00000＋(Y＆511)×1024＋(X＆511)×2
  BIT = (Y≧512)×8＋(X≧512)×4 ～  BIT = (Y≧512)×8＋(X≧512)×4 ～
-       (Y≧512)×8＋(X≧512)×4＋3 of 4 bits    +       (Y≧512)×8＋(X≧512)×4＋3 for 4 bits   
- +
- +
----- +
  
 ===== Text VRAM ===== ===== Text VRAM =====
x68000/video_ram_basics.1502662496.txt.gz · Last modified: 2019/08/27 20:44 (external edit)