PPU scrolling: Revision history

30 October 2024

• curprev 14:3314:33, 30 October 2024‎ Tepples talk contribs‎ 33,811 bytes +247‎ →‎Split X/Y scroll: iProgramInCpp asked for clarification of "; ..."; Zeta suggested erring on the side of doing the third write 4 pixels early

15 October 2024

• curprev 22:3622:36, 15 October 2024‎ Fiskbit talk contribs‎ 33,564 bytes +12‎ →‎Frequent pitfalls: Notes that PPUCTRL must also be written after using PPUADDR. Only setting PPUSCROLL is a common beginner mistake.

25 June 2024

• curprev 16:2516:25, 25 June 2024‎ Elemenity talk contribs‎ 33,552 bytes +148‎ Add register names to improve readability.

26 May 2024

• curprev 13:4413:44, 26 May 2024‎ Fiskbit talk contribs‎ 33,404 bytes 0‎ Moves $2007 behavior up with the other registers, because it was easy to miss. Removes some weird indentation. Adds some horizontal lines to help break things up a bit. (This page needs some more involved improvements in the future.)

10 March 2024

• curprev 17:1917:19, 10 March 2024‎ Lidnariq talk contribs‎ 33,404 bytes +100‎ →‎The common case: make scroll coordinate packing a little more explicit

10 December 2023

• curprev 12:1312:13, 10 December 2023‎ Fiskbit talk contribs‎ m 33,304 bytes −139‎ Reverted edits by Binary-sequence (talk) to last revision by Jroweboy Tag: Rollback
• curprev 09:2809:28, 10 December 2023‎ Binary-sequence talk contribs‎ 33,443 bytes +139‎ Add notice about other known names for the w register Tag: Reverted

18 August 2023

• curprev 18:2018:20, 18 August 2023‎ Jroweboy talk contribs‎ m 33,304 bytes −2‎ Split X/Y Scroll had an invalid value for the bitflags

6 August 2023

• curprev 13:2213:22, 6 August 2023‎ Zeta0134 talk contribs‎ m 33,306 bytes +25‎ In "the common case", writing to PPUADDR also clobbers the nametable bits set by PPUCTRL, so we should advise writing PPUCTRL at the end of vertical blanking

7 May 2023

• curprev 21:2621:26, 7 May 2023‎ Lidnariq talk contribs‎ 33,281 bytes +384‎ →‎Split X scroll: CutterCross was having problems due to the PPU being awsum

8 April 2023

• curprev 23:2323:23, 8 April 2023‎ Lidnariq talk contribs‎ 32,897 bytes +133‎ →‎$2005 first write (w is 0): add gotcha catcher

31 March 2023

• curprev 04:3704:37, 31 March 2023‎ Fiskbit talk contribs‎ 32,764 bytes +621‎ Adds tokumaru's 2006/2005/2005/2006 code with teaching-oriented edits. Received permission from tokumaru to host this on the wiki as public domain.

17 January 2023

• curprev 03:2003:20, 17 January 2023‎ Tepples talk contribs‎ 32,143 bytes +1‎ SG-1000 is a better known term, as "Mark" wasn't introduced until Mark III (early SMS)

26 June 2022

• curprev 17:5117:51, 26 June 2022‎ Lidnariq talk contribs‎ 32,142 bytes −13‎ →‎Details: avoid novel ".1" notation

5 November 2021

• curprev 15:1515:15, 5 November 2021‎ Tepples talk contribs‎ 32,155 bytes +409‎ →‎Split X scroll: Example code, on dougeff's request
• curprev 14:3314:33, 5 November 2021‎ Tepples talk contribs‎ 31,746 bytes +137‎ →‎Split X scroll: to fully avoid the glitch caused by $2005-only updates

7 April 2021

• curprev 02:4602:46, 7 April 2021‎ Quietust talk contribs‎ m 31,609 bytes +1‎ →‎Tile and attribute fetching
• curprev 02:3802:38, 7 April 2021‎ Quietust talk contribs‎ m 31,608 bytes +2‎ →‎Register controls: Also change "=" to "<-" to more clearly express that the values are being transferred (already updated the others above but missed these two)
• curprev 02:3502:35, 7 April 2021‎ Quietust talk contribs‎ 31,606 bytes +128‎ →‎Register controls: Adjust the diagrams for the various writes - order them ABCDEFGH (instead of HGFEDCBA) and mark unused bits. For the H/V updates, label the various bits according to their logical positions rather than their literal locations

24 December 2019

• curprev 16:3616:36, 24 December 2019‎ Dwedit talk contribs‎ 31,478 bytes −504‎ →‎At dot 255 of each scanline (scanline glitch)
• curprev 16:3316:33, 24 December 2019‎ Dwedit talk contribs‎ 31,982 bytes +504‎ →‎At dot 255 of each scanline (scanline glitch)

13 September 2019

• curprev 16:5916:59, 13 September 2019‎ Rainwarrior talk contribs‎ m 31,478 bytes +43‎ →‎Between dot 328 of a scanline, and 256 of the next scanline: clarify that this is coarse X, not to be confused with fine X, also clarify that this is a repeating process

25 July 2018

• curprev 23:2623:26, 25 July 2018‎ Rainwarrior talk contribs‎ 31,435 bytes +175‎ →‎PPU internal registers: adding note to explain why 15 <> 14

24 July 2018

• curprev 02:5602:56, 24 July 2018‎ Tepples talk contribs‎ 31,260 bytes +15‎ →‎The common case: With the release of a competently designed platformer under a free software license, this nonfree image is replaceable.

8 December 2017

• curprev 21:1721:17, 8 December 2017‎ Rainwarrior talk contribs‎ 31,245 bytes +109‎ See Also

26 September 2017

• curprev 18:2218:22, 26 September 2017‎ Tepples talk contribs‎ m 31,136 bytes +24‎ →‎Details: more specifically, a mid-scanline write
• curprev 13:2013:20, 26 September 2017‎ Tepples talk contribs‎ 31,112 bytes +87‎ →‎Details: More pedantry about when the effects of a v change takes effect, per https://forums.nesdev.com/viewtopic.php?p=205232#p205232

27 August 2017

• curprev 20:5620:56, 27 August 2017‎ Rainwarrior talk contribs‎ m 31,025 bytes −7‎ removing "up to 24", don't want to imply some magic significance to 24 (plus you can "jump the flagpole")

23 April 2017

• curprev 05:5305:53, 23 April 2017‎ Rainwarrior talk contribs‎ 31,032 bytes +19‎ →‎PPU registers: incorporating change from User:Bregalad/Split Scrolling, renaming as "PPU internal registers" and small edit to lead

7 April 2017

• curprev 08:5208:52, 7 April 2017‎ Bregalad talk contribs‎ m 31,013 bytes −13‎ →‎Single scroll: Rewording

6 April 2017

• curprev 19:0019:00, 6 April 2017‎ Rainwarrior talk contribs‎ 31,026 bytes +85‎ →‎Y increment: relevance to Overscan

16 January 2017

• curprev 23:0023:00, 16 January 2017‎ Koitsu talk contribs‎ 30,941 bytes −1‎ →‎Summary

7 December 2016

• curprev 03:0703:07, 7 December 2016‎ Tepples talk contribs‎ 30,942 bytes +40‎ →‎Frequent pitfalls: tl;dr version for both pitfalls

21 November 2016

• curprev 05:4005:40, 21 November 2016‎ Koitsu talk contribs‎ m 30,902 bytes +11‎ →‎Summary

21 July 2016

• curprev 14:2514:25, 21 July 2016‎ Tepples talk contribs‎ 30,891 bytes +223‎ →‎Explanation: Reiterate that fine X doesn't "count" during rendering per misunderstanding at http://forums.nesdev.com/viewtopic.php?p=175852#p175852

2 November 2015

• curprev 04:1004:10, 2 November 2015‎ Rainwarrior talk contribs‎ m 30,668 bytes +40‎ →‎Split X/Y scroll: full line split is hard to understand, to me, changing it to a "details" subheading

1 November 2015

• curprev 21:3821:38, 1 November 2015‎ Tepples talk contribs‎ 30,628 bytes +322‎ →‎Split X/Y scroll: added TL;DR instructions to top

25 March 2015

• curprev 04:0704:07, 25 March 2015‎ Rainwarrior talk contribs‎ m 30,306 bytes +1‎ sneaky whitespace
• curprev 04:0304:03, 25 March 2015‎ Rainwarrior talk contribs‎ m 30,305 bytes −5‎ →‎Frequent pitfalls: maybe better to say that $2005 always needs a rewrite after $2006, covers more use cases I think
• curprev 03:5803:58, 25 March 2015‎ Rainwarrior talk contribs‎ m 30,310 bytes +4‎ →‎Split X scroll: missed "bit"
• curprev 03:5103:51, 25 March 2015‎ Rainwarrior talk contribs‎ 30,306 bytes +491‎ →‎The common case: adding →‎Frequent pitfalls: section at tepples' suggestion
• curprev 03:2803:28, 25 March 2015‎ Rainwarrior talk contribs‎ m 29,815 bytes +8‎ →‎References: credit VRAM register image analysis to Quietust
• curprev 03:2503:25, 25 March 2015‎ Rainwarrior talk contribs‎ m 29,807 bytes +26‎ →‎PPU registers: clarify what "top left" means
• curprev 03:0003:00, 25 March 2015‎ Rainwarrior talk contribs‎ 29,781 bytes −13‎ →‎The common case: scroll seam isn't necessarily just offscreen, depends on your game's needs (revising words to make it clear this is a choice, not a requirement)
• curprev 02:4702:47, 25 March 2015‎ Rainwarrior talk contribs‎ m 29,794 bytes +5‎ →‎Register controls: missed $2005.1
• curprev 02:4602:46, 25 March 2015‎ Rainwarrior talk contribs‎ m 29,789 bytes +31‎ →‎Stuff that affects register contents: rename to →‎Register controls: and using headings for the various controls
• curprev 02:4202:42, 25 March 2015‎ Rainwarrior talk contribs‎ m 29,758 bytes −18‎ →‎PPU registers: removing self-link
• curprev 02:4102:41, 25 March 2015‎ Rainwarrior talk contribs‎ 29,776 bytes +27,677‎ merge from The skinny on NES scrolling

24 March 2015

• curprev 23:1723:17, 24 March 2015‎ Tepples talk contribs‎ 2,099 bytes −5,173‎ Consensus on talk is that everything after "The common case" is poorly written, and "Skinny" describes it better.
• curprev 20:4020:40, 24 March 2015‎ Rainwarrior talk contribs‎ m 7,272 bytes +58‎ →‎References: changing this to See Also, but also noting this should really be a merge job