PPU scrolling: Revision history

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
• curprev 20:3820:38, 24 March 2015‎ Rainwarrior talk contribs‎ 7,214 bytes +287‎ →‎The common case: trying to make description of timing/sequence more robust: clarifying "updates to VRAM" to mean $2006 use, explaining when $2005 must be written, and when scrolling is applied

16 March 2015

• curprev 01:4901:49, 16 March 2015‎ Koitsu talk contribs‎ 6,927 bytes +51‎ No edit summary

30 September 2014

• curprev 02:3602:36, 30 September 2014‎ Tepples talk contribs‎ 6,876 bytes +183‎ →‎Use of Loopy_V during rendering: Pixel 304 (end of prerender line's hsync pulse) is outdated info; newer info is that it happens continuously throughout this pulse

8 January 2013

• curprev 15:0215:02, 8 January 2013‎ Tepples talk contribs‎ 6,693 bytes +126‎ →‎Writes to PPUADDR: commented version of four-write sequence

18 December 2012

• curprev 20:0320:03, 18 December 2012‎ Tepples talk contribs‎ m 6,567 bytes −5‎ Parodius Da? more like Parodius DEL

1 December 2012

• curprev 14:5614:56, 1 December 2012‎ Tepples talk contribs‎ m 6,572 bytes −5‎ →‎Writes to PPUADDR: rm parodius

2 June 2012

• curprev 21:5921:59, 2 June 2012‎ Dwedit talk contribs‎ 6,577 bytes −83‎ →‎Timing
• curprev 21:5421:54, 2 June 2012‎ Dwedit talk contribs‎ 6,660 bytes +35‎ →‎Timing
• curprev 21:5321:53, 2 June 2012‎ Dwedit talk contribs‎ 6,625 bytes +108‎ →‎Timing
• curprev 21:5021:50, 2 June 2012‎ Dwedit talk contribs‎ 6,517 bytes +12‎ →‎Timing
• curprev 21:5021:50, 2 June 2012‎ Dwedit talk contribs‎ 6,505 bytes +391‎ →‎Writes to PPUADDR: add timing section

18 October 2011

• curprev 12:3112:31, 18 October 2011‎ Tepples talk contribs‎ 6,114 bytes −37‎ →‎References: What is skinny has been fattened up

25 July 2011

• curprev 15:4315:43, 25 July 2011‎ Tepples talk contribs‎ m 6,151 bytes +101‎ →‎Writes to PPUSCROLL: typo reported by ehguacho

24 May 2011

• curprev 10:4910:49, 24 May 2011‎ Tepples talk contribs‎ m 6,050 bytes −67‎ Delay explanation of the four-write sequence until after both registers have been explained
• curprev 10:4710:47, 24 May 2011‎ Tepples talk contribs‎ 6,117 bytes +649‎ →‎Writes to PPUSCROLL: Drag's explanation

10 April 2011

• curprev 21:2421:24, 10 April 2011‎ Tepples talk contribs‎ 5,468 bytes +139‎ →‎Writes to PPUSCROLL: To make them take effect immediately

12 September 2010

• curprev 01:1201:12, 12 September 2010‎ Tepples talk contribs‎ 5,329 bytes +75‎ →‎What the registers do: What do all the bits copied at the end of the scanline have in common? They all control the horizontal scroll position.

3 July 2010

• curprev 19:1719:17, 3 July 2010‎ Tepples talk contribs‎ 5,254 bytes +98‎ →‎The common case: center animation
• curprev 19:1519:15, 3 July 2010‎ Tepples talk contribs‎ 5,156 bytes +77‎ Put it in a consistent style: mention the register by name and address the first time in an h2 section, then by name only
• curprev 19:1119:11, 3 July 2010‎ Tepples talk contribs‎ 5,079 bytes +1,476‎ The common case

25 February 2010

• curprev 15:2615:26, 25 February 2010‎ Bregalad talk contribs‎ 3,603 bytes −32‎ Parially removed GBA-style reigster names (exept when the normal adress were alredy present)

12 June 2009

• curprev 15:4215:42, 12 June 2009‎ Banshaku talk contribs‎ m 3,635 bytes +3,635‎ Created page with 'Writing to <code>PPUSCROLL</code> ($2005) and <code>PPUADDR</code> ($2006) affects the same internal PPU registers, but in different ways. The same 15-bit VRAM addres...'