User contributions for Persune

6 June 2023

• 20:1120:11, 6 June 2023 diff hist +40,426‎ PPU palettes ‎ Overhaul palette color tables

20 May 2023

• 10:3710:37, 20 May 2023 diff hist +1,053‎ N File:Quadrature demodulation.svg ‎ This diagram illustrates quadrature demodulation, used in decoding composite signals to color YUV. More details can be found on the NTSC video page. The three graphs on the left shows how the Y, U, and V component signals are decoded using the composite signal and a reference carrier wave. The polar graph on the right shows the resulting color phase and saturation of the decoded color. The Y component (shown in orange) is decoded by low passing or comb filtering the input signal. (show... current

19 May 2023

• 06:3206:32, 19 May 2023 diff hist +712‎ NTSC video ‎ Update composite decoding terminology; hint at colorimetry details

25 April 2023

• 19:4319:43, 25 April 2023 diff hist +4,597‎ PPU palettes ‎ Format palette tables for RGB PPUs

23 April 2023

• 19:0319:03, 23 April 2023 diff hist 0‎ m User:Persune ‎ Odd-Even pinout for consistency with schematics
• 17:4417:44, 23 April 2023 diff hist +1,183‎ User:Persune ‎ Famicom EPSM access

14 April 2023

• 08:3308:33, 14 April 2023 diff hist +9‎ m PAL video ‎ Missing "notes" column name

12 April 2023

• 07:1407:14, 12 April 2023 diff hist +465‎ PAL video ‎ Cite timing sources
• 07:0907:09, 12 April 2023 diff hist +445‎ NTSC video ‎ Cite timing sources
• 07:0007:00, 12 April 2023 diff hist +3,377‎ PAL video ‎ Add scanline timings
• 05:1805:18, 12 April 2023 diff hist 0‎ File:Pal video timing.png ‎ Persune uploaded a new version of File:Pal video timing.png current
• 04:5904:59, 12 April 2023 diff hist +93‎ NTSC video ‎ Indicate where VBlank is set and cleared
• 04:3704:37, 12 April 2023 diff hist +516‎ m NTSC video ‎ Use colored squares instead of names

11 April 2023

• 20:2820:28, 11 April 2023 diff hist +86‎ File:Pal video timing.png ‎ Reword description; fix hyperlink
• 20:2520:25, 11 April 2023 diff hist +945‎ N File:Pal video timing.png ‎ A visualization of the PAL PPU's video output signal, using different colors to denote each part of the signal. Based on File:Ntsc_video_timing.png. The video output of the PPU is delayed by 1 pixel clock. In addition, the active video portion is delayed by another 1 pixel clock. Cycle 0, scanline 0 according to the [https://www.nesdev.org/wiki/File:Ppu.svg PPU Frame Timing Diagram] is marked by the black pixel. * Cyan is the horizontal blanking pulse * Dark blue is the "back porch" aft...
• 20:1920:19, 11 April 2023 diff hist +1,139‎ NTSC video ‎ Reposition start times of scanline timings, use more accurate terms for components of composite video
• 19:0019:00, 11 April 2023 diff hist +82‎ File:Ntsc video timing.png ‎ Clarify delay between internal PPU abstraction and output composite signal current
• 12:5812:58, 11 April 2023 diff hist 0‎ m File:Ntsc video timing.png ‎ Off-by-one error
• 10:5810:58, 11 April 2023 diff hist −24‎ File:Ntsc video timing.png ‎ PPU skipped dot is off by 1 scanline and 1 dot
• 10:5710:57, 11 April 2023 diff hist 0‎ File:Ntsc video timing.png ‎ Persune uploaded a new version of File:Ntsc video timing.png
• 08:5808:58, 11 April 2023 diff hist 0‎ m File:Ntsc video timing.png ‎ Gray pulse happens on cycle 327
• 08:1808:18, 11 April 2023 diff hist +205‎ File:Ntsc video timing.png ‎ Describe cycle 0 pixel and dot skip pixel
• 08:0908:09, 11 April 2023 diff hist 0‎ File:Ntsc video timing.png ‎ Persune uploaded a new version of File:Ntsc video timing.png

9 March 2023

• 08:2108:21, 9 March 2023 diff hist +2‎ m NTSC video ‎ Refer to both matrices instead of the original single matrix
• 08:2008:20, 9 March 2023 diff hist +280‎ NTSC video ‎ Add YUV to linear RGB conversion matrix in terms of YUV only
• 08:0708:07, 9 March 2023 diff hist 0‎ m NTSC video ‎ Correct swapped color reduction factors

8 March 2023

• 18:3118:31, 8 March 2023 diff hist +201‎ NTSC video ‎ Clarify IQ to UV rotation matrix (thanks to NewRisingSun for clarifications)
• 17:0617:06, 8 March 2023 diff hist +964‎ NTSC video ‎ Reword composite decoding summary (thanks to NewRisingSun for clarifications)
• 10:2610:26, 8 March 2023 diff hist +107‎ m NTSC video ‎ Add link to FCC-sanctioned YIQ to RGB conversion base equations
• 10:1910:19, 8 March 2023 diff hist +3,241‎ NTSC video ‎ Add section for composite video decoding

27 February 2023

• 11:0611:06, 27 February 2023 diff hist −210‎ NTSC video ‎ Plot example waveform via PPUPlayer's video signal dump
• 11:0311:03, 27 February 2023 diff hist 0‎ File:Composite waveform example.gif ‎ Persune uploaded a new version of File:Composite waveform example.gif current
• 04:3304:33, 27 February 2023 diff hist +193‎ m File:Composite waveform example.gif ‎ Add details about plot
• 04:2704:27, 27 February 2023 diff hist +524‎ N File:Composite waveform example.gif ‎ This waveform steps through various grays and then stops on a color. Based on the original ASCII art of the example composite waveform. https://www.nesdev.org/wiki/NTSC_video#Example_Waveform The composite signal steps through 6 gray colors ($0D, $0F, $2D, $00, $10, $30) then continues through with color $11. [https://github.com/Gumball2415/nes-scribbles/tree/main/nrom-composite-waveform Source code for the underlying demo rom], and this work is licensed under the [https://mit-license.org...

26 February 2023

• 19:4519:45, 26 February 2023 diff hist +9‎ NTSC video ‎ Animate "ragged" NTSC demodulation illustration
• 19:0719:07, 26 February 2023 diff hist +571‎ N File:NTSC video ragged box animated.gif ‎ Animated version of https://www.nesdev.org/wiki/File:NTSC_video_ragged_box.png. The second frame is made by offsetting the frame by 1 "scanline". The filter is replicated as two Convolution Matrix passes in linear light space using GIMP 2.10.32. The kernels used are [1 1 0 1 1] and [1 3 4 3 1] respectively. After filtering the resulting kernels, an approximate 2.4 gamma curve is applied using the Levels tool, setting the middle slider to 1/2.4 (approx. 0.42). This derivative work is also... current

11 February 2023

• 16:4516:45, 11 February 2023 diff hist 0‎ File:NES-EWROM-01.svg ‎ Persune uploaded a new version of File:NES-EWROM-01.svg current
• 16:4416:44, 11 February 2023 diff hist −5‎ NES cartridge dimensions ‎ Update cutout hole dimensions current

26 November 2022

• 08:4308:43, 26 November 2022 diff hist +223‎ User:Persune ‎ Update

20 September 2022

• 04:1004:10, 20 September 2022 diff hist 0‎ m NES cartridge dimensions ‎ Fix designator reference length

18 September 2022

• 15:5415:54, 18 September 2022 diff hist −1‎ m NES cartridge dimensions ‎ Fix designator references
• 15:5315:53, 18 September 2022 diff hist 0‎ File:NES-EWROM-01.svg ‎ Persune uploaded a new version of File:NES-EWROM-01.svg
• 15:4915:49, 18 September 2022 diff hist −28‎ m NES cartridge dimensions ‎ Remove nonexistent reference
• 15:4015:40, 18 September 2022 diff hist +258‎ m NES cartridge dimensions ‎ Add introduction
• 15:3415:34, 18 September 2022 diff hist +23‎ m Famicom cartridge dimensions ‎ Add category current
• 15:3415:34, 18 September 2022 diff hist +1,284‎ NES cartridge dimensions ‎ Add measurements for the nearly the rest of the cartridge types
• 15:2215:22, 18 September 2022 diff hist +135‎ N File:NES-EWROM-01.svg ‎ Technical drawing of the outlines of an NES-EWROM-01 type cartridge PCB. Dimensions described in corresponding wiki page.

20 January 2022

• 18:1518:15, 20 January 2022 diff hist +1‎ m Famicom cartridge dimensions ‎ Correct measurement tolerances
• 16:5516:55, 20 January 2022 diff hist +18‎ m Famicom cartridge dimensions ‎ →‎HVC-N/Cx/Gx/UxROM 01-05 (discrete mapper boards)
• 16:5416:54, 20 January 2022 diff hist −49‎ Famicom cartridge dimensions ‎ →‎HVC-Ax/Fx/Px/Sx/TxROM (MMC1-4 mapper boards)