File:Ntsc video timing.png

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Revision as of 19:00, 11 April 2023 by Persune (talk | contribs) (Clarify delay between internal PPU abstraction and output composite signal)
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Ntsc_video_timing.png(341 × 262 pixels, file size: 1 KB, MIME type: image/png)

A visualization of the NTSC PPU's video output signal, using different colors to denote each part of the signal.

The video output of the PPU is delayed by 1 pixel clock; this means that cycle 0, scanline 0 according to the PPU Frame Timing Diagram is marked by the black pixel.

  • Cyan is the horizontal blanking pulse
  • Dark blue is the "back porch" after HBlank
    • Yellow is the colorburst signal
  • Red is the visible output region, including the left and right border
    • Bright green is the grayscale pulse (at cycle 326)
    • Bright red is where the background and sprites are actually visible
    • The orange dot is skipped on odd frames (340, 261)
  • Orange is the "front porch" before HBlank
  • Magenta is the vertical blanking pulse
  • Dark green is the surrounding vertical blanking region (and the sync separator)

File history

Click on a date/time to view the file as it appeared at that time.

Date/TimeThumbnailDimensionsUserComment
current10:57, 11 April 2023Thumbnail for version as of 10:57, 11 April 2023341 × 262 (1 KB)Persune (talk | contribs)PPU dot skipped is off by 1 scanline
08:09, 11 April 2023Thumbnail for version as of 08:09, 11 April 2023341 × 262 (1 KB)Persune (talk | contribs)Remove uneccesary indicators; add cycle 0 dot indicator; fix dot skip indicator
21:56, 21 September 2021Thumbnail for version as of 21:56, 21 September 2021405 × 326 (3 KB)>Maintenance script== Summary == Importing file

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