PPU registers: Revision history

24 October 2024

• curprev 19:5219:52, 24 October 2024‎ Fiskbit talk contribs‎ m 39,769 bytes −23‎ Fixes the anchors; apparently HTML escape codes aren't acceptable.
• curprev 19:4619:46, 24 October 2024‎ Fiskbit talk contribs‎ m 39,792 bytes +314‎ Adds anchors for old section names, to unbreak old links.

15 October 2024

• curprev 22:3422:34, 15 October 2024‎ Fiskbit talk contribs‎ 39,478 bytes +320‎ →‎PPUADDR - VRAM address ($2006 write): Adds some more details about the high bit of t being cleared on PPUADDR 2nd write.
• curprev 21:3921:39, 15 October 2024‎ Quietust talk contribs‎ m 39,158 bytes +50‎ important note - bit 14 actually exists as the upper Y scroll bit, but the first write to $2006 clears it (thus necessitating the "6/5/5/6" trick)

12 October 2024

• curprev 03:1103:11, 12 October 2024‎ Fiskbit talk contribs‎ 39,108 bytes +7,709‎ Reformats the page and rewrites most of the description of the $2000, $2001, $2002, and $4014 registers. The other registers still need to be updated. $2006 was slightly touched up, but could probably use more work.

21 June 2024

• curprev 04:2304:23, 21 June 2024‎ DrakRoar talk contribs‎ 31,399 bytes +360‎ Some cleanup and more detail on the PPU warm-up state

11 June 2024

• curprev 04:3704:37, 11 June 2024‎ Fiskbit talk contribs‎ 31,039 bytes +809‎ Adds information on palette reads and that they don't work right on all consoles. Adds horizontal lines for formatting.

26 May 2024

• curprev 14:3314:33, 26 May 2024‎ Fiskbit talk contribs‎ 30,230 bytes −20‎ →‎Data ($2007) read/write: Removes a link to the "Reading 2007 during rendering" because this page is impenetrable to most the people who will be reading this. Cleans up the PPU scrolling link.
• curprev 14:2914:29, 26 May 2024‎ Tepples talk contribs‎ 30,250 bytes +87‎ →‎Data ($2007) read/write: link to a more useful article about the scroll position effect

13 December 2023

• curprev 13:5613:56, 13 December 2023‎ Quietust talk contribs‎ m 30,163 bytes +14‎ →‎Controller ($2000) > write: reword, otherwise it sounds like it's suggestin writing to $2000 to clear the vblank flag
• curprev 04:4604:46, 13 December 2023‎ Fiskbit talk contribs‎ m 30,149 bytes +8‎ →‎Internal registers: Wording on v description.

10 December 2023

• curprev 12:1112:11, 10 December 2023‎ Fiskbit talk contribs‎ 30,141 bytes +798‎ Better-integrates internal registers into this page. Makes improvements to the PPUSCROLL and PPADDR descriptions.
• curprev 09:1909:19, 10 December 2023‎ Binary-sequence talk contribs‎ 29,343 bytes +562‎ Add "internal registers" to “PPU registers" page

20 November 2023

• curprev 05:2305:23, 20 November 2023‎ TakuikaNinja talk contribs‎ 28,781 bytes +29‎ Link to OAM article concerning sprite 0 hits.

14 November 2023

• curprev 17:0717:07, 14 November 2023‎ Fiskbit talk contribs‎ 28,752 bytes +333‎ →‎The PPUDATA read buffer (post-fetch): More improvements for clarity based on feedback.

9 October 2023

• curprev 09:5609:56, 9 October 2023‎ Fiskbit talk contribs‎ 28,419 bytes +1,135‎ Updates the scroll section to make it clear that scroll must be written *after* PPUADDR and *with* PPUCTRL. Rewrites the palette read section for hopefully more detail and clarity, and to mention that not all PPUs support reading palettes.

9 May 2023

• curprev 00:2500:25, 9 May 2023‎ Lidnariq talk contribs‎ m 27,284 bytes −7‎ →‎OAM data ($2004) read/write: move 'reads don't increment' right next to 'writes do' to place the comparison immediately adjacent

31 March 2023

• curprev 04:3804:38, 31 March 2023‎ Fiskbit talk contribs‎ 27,291 bytes −263‎ →‎Note: Tokumaru's quad-write code is now hosted on the PPU scrolling page.

29 March 2023

• curprev 05:2505:25, 29 March 2023‎ Lidnariq talk contribs‎ 27,554 bytes +98‎ →‎Palette corruption: also one other good thread about this
• curprev 05:1605:16, 29 March 2023‎ Lidnariq talk contribs‎ m 27,456 bytes −10‎ →‎Palette corruption: not only white...
• curprev 05:0505:05, 29 March 2023‎ Lidnariq talk contribs‎ 27,466 bytes +782‎ →‎Address ($2006) >> write x2: add "palette corruption" bug

25 March 2023

• curprev 03:1803:18, 25 March 2023‎ Fiskbit talk contribs‎ 26,684 bytes +26‎ →‎OAM DMA ($4014) > write: Purging yet another use of even/odd CPU cycle terminology in favor of get/put.

12 February 2023

• curprev 21:2021:20, 12 February 2023‎ Jeffythedragonslayer talk contribs‎ m 26,658 bytes +4‎ →‎OAM data ($2004) read/write: italics on Micro Machines

29 January 2023

• curprev 22:4622:46, 29 January 2023‎ Rainwarrior talk contribs‎ m 26,654 bytes 0‎ →‎Values during rendering: X/Y capitalized
• curprev 22:4522:45, 29 January 2023‎ Rainwarrior talk contribs‎ 26,654 bytes +722‎ →‎OAM address ($2003) > write: trying to clarify the various corruption descriptions here

18 January 2023

• curprev 09:5009:50, 18 January 2023‎ Qalle talk contribs‎ m 25,932 bytes −4‎ revert × to x for searchability

12 January 2023

• curprev 20:5820:58, 12 January 2023‎ Qalle talk contribs‎ 25,936 bytes +25‎ punctuation

4 November 2022

• curprev 22:0822:08, 4 November 2022‎ Rainwarrior talk contribs‎ m 25,911 bytes +23‎ →‎Render Control: more specific errata link

6 October 2022

• curprev 03:5503:55, 6 October 2022‎ Rainwarrior talk contribs‎ m 25,888 bytes +4‎ →‎OAM DMA ($4014) > write: DMA

10 June 2022

• curprev 09:4809:48, 10 June 2022‎ Fiskbit talk contribs‎ 25,884 bytes −46‎ →‎Status ($2002): Improves open bus bits description.

16 May 2022

• curprev 09:5409:54, 16 May 2022‎ Lidnariq talk contribs‎ m 25,930 bytes +27‎ →‎Controller ($2000) > write: Link to explanation of how 8x16 sprites are enumerated

11 December 2021

• curprev 21:0621:06, 11 December 2021‎ Lidnariq talk contribs‎ 25,903 bytes +414‎ →‎Status ($2002): big ol' warning label about don't poll $2002

29 December 2020

• curprev 06:3206:32, 29 December 2020‎ Rainwarrior talk contribs‎ 25,489 bytes +40‎ →‎Mask ($2001) > write: PAL colour functions

12 December 2020

• curprev 05:1505:15, 12 December 2020‎ Rainwarrior talk contribs‎ 25,449 bytes +419‎ →‎Data ($2007) read/write: should really have a note about the DPCM conflict here

9 November 2020

• curprev 12:5412:54, 9 November 2020‎ Quietust talk contribs‎ m 25,030 bytes −12‎ Bulleted lists shouldn't have blank lines between entries, otherwise each entry is rendered as its own distinct list

6 November 2020

• curprev 06:0506:05, 6 November 2020‎ Tepples talk contribs‎ 25,042 bytes +24‎ The article is not about ventriloquism. Might "priming read" work better?

23 June 2020

• curprev 16:3316:33, 23 June 2020‎ Krzysiobal talk contribs‎ 25,018 bytes +37‎ →‎Data ($2007) read/write: - nobody mentioned that playing with PPUADDR also clobberts the internal bits that PPUCTRL[1..0] controls.

10 May 2020

• curprev 00:4300:43, 10 May 2020‎ Lidnariq talk contribs‎ 24,981 bytes +102‎ protocol-relative URLs are no longer automatically converted into links?? also a few "2003" should have been "2004"

24 April 2020

• curprev 06:3006:30, 24 April 2020‎ Lidnariq talk contribs‎ 24,879 bytes +377‎ →‎Address ($2006) >> write x2: mention PPUADDR bus conflict here.

10 October 2019

• curprev 23:3023:30, 10 October 2019‎ Lidnariq talk contribs‎ 24,502 bytes −68‎ Undo good-faith edit that removed protocol-relative URLs by PostNES (talk)
• curprev 22:0222:02, 10 October 2019‎ PostNES talk contribs‎ m 24,570 bytes +68‎ wikify

17 March 2019

• curprev 03:0103:01, 17 March 2019‎ Tepples talk contribs‎ 24,502 bytes +20‎ →‎Controller ($2000) > write: twicetime in #nesdev on EFnet was confused about whether writing to $2000 with bit 7 set always caused an NMI. I replied that it's about changing from 0 to 1.

6 February 2019

• curprev 07:1407:14, 6 February 2019‎ Lidnariq talk contribs‎ m 24,482 bytes −35‎ protocol-relative links to forum

16 January 2019

• curprev 18:1018:10, 16 January 2019‎ Tepples talk contribs‎ 24,517 bytes +117‎ →‎OAM data ($2004) read/write: Do not write directly

15 December 2018

• curprev 21:1821:18, 15 December 2018‎ Lidnariq talk contribs‎ 24,400 bytes +182‎ →‎Bit 0 bus conflict: it's not a bus conflict, and we appear to have an accurate explanation of what's causing it now.

14 November 2018

• curprev 19:0519:05, 14 November 2018‎ Pubby talk contribs‎ 24,218 bytes +53‎ clarify race condition behavior

4 November 2018

• curprev 00:2000:20, 4 November 2018‎ Koitsu talk contribs‎ 24,165 bytes −1,008‎ →‎Mask ($2001) > write

19 October 2018

• curprev 07:2807:28, 19 October 2018‎ Trozze talk contribs‎ 25,173 bytes +1‎ Fixed incorrectly expanded MSB and LSB acronyms

18 October 2018

• curprev 23:3323:33, 18 October 2018‎ Qalle talk contribs‎ 25,172 bytes +163‎ clarifications

11 August 2018

• curprev 17:3417:34, 11 August 2018‎ Rainwarrior talk contribs‎ 25,009 bytes −24‎ →‎Bit 0 bus conflict: I think predicting a sprite 0 fail crash is going a bit extreme, all we need to warn is that the mischosen background can interfere with sprite 0 on that particular scanline.