Two backlit LCD screens made by Sharp. 256x192 resolution
NDS video timing information:
- Both screens are updated simultaneously.
- 355 pixels/line
- 263 lines/frame
- 2130 clocks/line
- 6 clocks/pixel
- H-blank signal is low for 264 pixels every scanline
- V-blank signal is low for 193 scanlines + 8 pixels every frame
- 560,190 clocks/frame
- 59.8 frames/second
- 15,727.4 lines/second
- Note: this timing is identical to NTSC television.
- The clock cycles at 33,499,362.6 Hz (timer input)
Note: these timings are based on a single program (with multiple overlapping methods of measuring some quantities), and on a single DS. Another DS may have a slightly different clock rate.
Although there are 256x192 visible pixels, the v-blank bit stays low for 193 scanlines and 8 pixels longer than that, and the h-blank bit stays low for 8 pixels longer than it should.
<Theory>
This is because of the way the DS renders graphics. It needs a full scanline at the beginning of the frame (more likely at the end of the previous frame) to scan OAM for sprites visible on the next scanline. Presumably the 8 pixels are for 8 vram fetches (one per layer, 4 layers per core) to prime the 2D cores.
</Theory>
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