Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision
Previous revision
x68000:video_ram_basics [2017/08/14 08:14]
neko68k
x68000:video_ram_basics [2017/08/16 16:17]
neko68k
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.txt · Last modified: 2019/08/27 20:45 (external edit)
 
Except where otherwise noted, content on this wiki is licensed under the following license: CC Attribution-Noncommercial-Share Alike 4.0 International
Recent changes RSS feed Driven by DokuWiki