x68000:video_ram_basics
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x68000:video_ram_basics [2017/08/14 08:14] – neko68k | x68000:video_ram_basics [2019/08/27 20:45] (current) – external edit 127.0.0.1 | ||
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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 | + | BIT = P×8 ~ P×8+7 |
- | == 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 | + | BIT = P×4 ~ P×4+3 |
- | == 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 | + | (Y≧512)×8+(X≧512)×4+3 |
- | + | ||
- | + | ||
- | ---- | + | |
===== Text VRAM ===== | ===== Text VRAM ===== |
x68000/video_ram_basics.txt · Last modified: 2019/08/27 20:45 by 127.0.0.1