The skinny on NES scrolling: Revision history

25 March 2015

• curprev 02:4102:41, 25 March 2015‎ Rainwarrior talk contribs‎ 27 bytes −28,551‎ merge to PPU scrolling
• curprev 02:3602:36, 25 March 2015‎ Rainwarrior talk contribs‎ 28,578 bytes +189‎ adding references section
• curprev 00:0700:07, 25 March 2015‎ Rainwarrior talk contribs‎ m 28,389 bytes 0‎ →‎Summary: letting $2000 nametable carry through to $2002 in diagram (not entirely happy that the diagram suggests a series of actions, but maybe clear enough that it isn't a suggested course of action now)

24 March 2015

• curprev 23:3923:39, 24 March 2015‎ Rainwarrior talk contribs‎ m 28,389 bytes −362‎ →‎Stuff that affects register contents: removing irrelevant commentary about frame timing sources, replacing image link with article link to frame timing
• curprev 23:1923:19, 24 March 2015‎ Rainwarrior talk contribs‎ m 28,751 bytes −36‎ unique colour for w register highlight in diagrams
• curprev 23:1423:14, 24 March 2015‎ Rainwarrior talk contribs‎ 28,787 bytes +725‎ →‎Split X/Y scroll: including w register in diagram
• curprev 23:1023:10, 24 March 2015‎ Rainwarrior talk contribs‎ 28,062 bytes +53‎ →‎Summary: interpage link to Examples (also kind of reinforces that this diagram isn't a usage example)
• curprev 22:5622:56, 24 March 2015‎ Rainwarrior talk contribs‎ 28,009 bytes +5,599‎ →‎Stuff that affects register contents: resurrecting koitsu's other diagram as a summary of register writing
• curprev 22:3722:37, 24 March 2015‎ Rainwarrior talk contribs‎ 22,410 bytes +231‎ →‎Split X scroll: this example incorrectly omits the need for $2000
• curprev 22:2322:23, 24 March 2015‎ Rainwarrior talk contribs‎ 22,179 bytes −419‎ →‎Examples: this preamble is vestigial, doesn't apply anymore (was for one of the examples which is already sufficiently explained)
• curprev 19:1619:16, 24 March 2015‎ Rainwarrior talk contribs‎ 22,598 bytes −256‎ →‎Preface: trimming personal commentary

5 March 2015

• curprev 22:5622:56, 5 March 2015‎ Tepples talk contribs‎ 22,854 bytes +44‎ →‎PPU registers: T is also for top left

23 October 2014

• curprev 01:1301:13, 23 October 2014‎ Rainwarrior talk contribs‎ m 22,810 bytes −5‎ →‎Preface: "tell how exactly" is strange, maybe compromise with "explain how"?

22 October 2014

• curprev 23:3723:37, 22 October 2014‎ Lidnariq talk contribs‎ m 22,815 bytes −1‎ colloquial english idiom is "in detail"
• curprev 23:1623:16, 22 October 2014‎ Zepper talk contribs‎ m 22,816 bytes −4‎ →‎Preface

19 October 2014

• curprev 13:2313:23, 19 October 2014‎ Zepper talk contribs‎ 22,820 bytes +29‎ →‎Y increment: cosmetic changes

7 October 2014

• curprev 21:5121:51, 7 October 2014‎ Zepper talk contribs‎ m 22,791 bytes +49‎ →‎Stuff that affects register contents: The BF case.

7 April 2014

• curprev 13:2813:28, 7 April 2014‎ Tepples talk contribs‎ 22,742 bytes +6‎ better yet, match the shade of red in "After" above
• curprev 04:5904:59, 7 April 2014‎ Lidnariq talk contribs‎ m 22,736 bytes +1‎ →‎Split X/Y scroll: make the red just a little more pale for better readability

6 April 2014

• curprev 21:5521:55, 6 April 2014‎ Rainwarrior talk contribs‎ m 22,735 bytes +42‎ →‎Split X/Y scroll: colour highlight to indicate change of t bit 14

3 July 2013

• curprev 09:2209:22, 3 July 2013‎ Ulfalizer talk contribs‎ 22,693 bytes +66‎ Status of increment bit does not influence what happens for $2007 access during rendering

28 June 2013

• curprev 17:4417:44, 28 June 2013‎ Quietust talk contribs‎ m 22,627 bytes 0‎ →‎Y increment
• curprev 17:4117:41, 28 June 2013‎ Quietust talk contribs‎ m 22,627 bytes −87‎ →‎Explanation
• curprev 17:3117:31, 28 June 2013‎ Quietust talk contribs‎ 22,714 bytes +199‎ →‎Stuff that affects register contents: a few tweaks; I also think I understand why $2006 clears bit 14, after looking at the chip more closely
• curprev 05:1605:16, 28 June 2013‎ Ulfalizer talk contribs‎ 22,515 bytes +529‎ The story with $2007 access during rendering is more complicated (but also pretty straightforward)

16 March 2013

• curprev 17:4017:40, 16 March 2013‎ Ulfalizer talk contribs‎ 21,986 bytes +131‎ Add link to NTSC PPU SVG timing diagram.

12 January 2013

• curprev 08:4308:43, 12 January 2013‎ Rainwarrior talk contribs‎ 21,855 bytes +477‎ →‎Stuff that affects register contents: X increments during rendering
• curprev 06:5206:52, 12 January 2013‎ Rainwarrior talk contribs‎ m 21,378 bytes −14‎ pixel != dot, apparently

11 January 2013

• curprev 09:5809:58, 11 January 2013‎ Rainwarrior talk contribs‎ m 21,392 bytes 0‎ fixing other references to dot 250 -> 256
• curprev 09:5509:55, 11 January 2013‎ Rainwarrior talk contribs‎ m 21,392 bytes −6‎ →‎Stuff that affects register contents: formatting
• curprev 09:5409:54, 11 January 2013‎ Rainwarrior talk contribs‎ 21,398 bytes +235‎ →‎Stuff that affects register contents: revising what happens at end of vblank
• curprev 09:5009:50, 11 January 2013‎ Rainwarrior talk contribs‎ m 21,163 bytes 0‎ →‎Stuff that affects register contents: Y increment is at dot 256, not 250, and t->v horizontal copy is at 257.

10 January 2013

• curprev 20:5320:53, 10 January 2013‎ Lidnariq talk contribs‎ 21,163 bytes +2,954‎ Add description of short writes (2005/2006 is commented out pending verification)
• curprev 08:4208:42, 10 January 2013‎ Lidnariq talk contribs‎ m 18,209 bytes +24‎ →‎Stuff that affects register contents: Reads from PPUDATA also clock the counters.

9 January 2013

• curprev 20:5920:59, 9 January 2013‎ Lidnariq talk contribs‎ m 18,185 bytes −158‎ →‎PPU registers: Nothing on this page (I think?) refers to v or t as 16-bit anymore, so remove the disclaimer
• curprev 20:5820:58, 9 January 2013‎ Lidnariq talk contribs‎ m 18,343 bytes +1‎ →‎Y increment: balance apostrophes
• curprev 01:3201:32, 9 January 2013‎ Rainwarrior talk contribs‎ m 18,342 bytes +3‎ →‎Split X/Y scroll: grammar fix
• curprev 01:3101:31, 9 January 2013‎ Rainwarrior talk contribs‎ m 18,339 bytes +4‎ →‎Split X/Y scroll: fix typo
• curprev 01:2801:28, 9 January 2013‎ Rainwarrior talk contribs‎ m 18,335 bytes +30‎ →‎Preface: clarifying changes
• curprev 01:2401:24, 9 January 2013‎ Rainwarrior talk contribs‎ 18,305 bytes +249‎ →‎PPU registers: diagram of register during rendering
• curprev 01:0101:01, 9 January 2013‎ Rainwarrior talk contribs‎ 18,056 bytes +731‎ →‎Wrapping around: address mangling for tile/attribute data
• curprev 00:3200:32, 9 January 2013‎ Rainwarrior talk contribs‎ m 17,325 bytes +46‎ →‎Y increment: comment increment
• curprev 00:3100:31, 9 January 2013‎ Rainwarrior talk contribs‎ m 17,279 bytes 0‎ →‎Y increment: clarify order of operations
• curprev 00:3000:30, 9 January 2013‎ Rainwarrior talk contribs‎ m 17,279 bytes +174‎ →‎Wrapping around: note that optimization is not the goal for this psuedocode-- note to avoid future obfuscation by optimization
• curprev 00:2600:26, 9 January 2013‎ Rainwarrior talk contribs‎ m 17,105 bytes +32‎ →‎Coarse X increment: simplifying example
• curprev 00:2400:24, 9 January 2013‎ Rainwarrior talk contribs‎ m 17,073 bytes +8‎ →‎Y increment: comment alignment
• curprev 00:2300:23, 9 January 2013‎ Rainwarrior talk contribs‎ m 17,065 bytes +1‎ →‎Y increment =: fix =
• curprev 00:2200:22, 9 January 2013‎ Rainwarrior talk contribs‎ 17,064 bytes +1,117‎ →‎Wrapping around: pseudocode explaining wrapping (based on nintendulator, but simplified)

8 January 2013

• curprev 23:4623:46, 8 January 2013‎ Rainwarrior talk contribs‎ m 15,947 bytes +111‎ →‎Stuff that affects register contents: note about $2007 incrementing Y scroll (based on nintendulator)
• curprev 23:4323:43, 8 January 2013‎ Rainwarrior talk contribs‎ m 15,836 bytes 0‎ →‎single scroll: capital
• curprev 23:4123:41, 8 January 2013‎ Rainwarrior talk contribs‎ m 15,836 bytes −15‎ →‎split X/Y scroll: notes on hblank timing
• curprev 23:3323:33, 8 January 2013‎ Rainwarrior talk contribs‎ m 15,851 bytes −35‎ →‎Split X scroll: "CPU is slower than the PPU" is a little bit confusing, I think
• curprev 22:0322:03, 8 January 2013‎ Rainwarrior talk contribs‎ m 15,886 bytes 0‎ →‎split X/Y scroll: capital N
• curprev 20:3820:38, 8 January 2013‎ Lidnariq talk contribs‎ m 15,886 bytes +312‎ →‎split X scroll: I RE'd galaxian, and it uses X splits extensively. Rewrite about half.
• curprev 13:2813:28, 8 January 2013‎ Rainwarrior talk contribs‎ m 15,574 bytes 0‎ →‎Stuff that affects register contents: presuming nintendulator correct, removing ?
• curprev 13:2613:26, 8 January 2013‎ Rainwarrior talk contribs‎ 15,574 bytes +412‎ →‎split X/Y scroll: more notes on timing
• curprev 13:1713:17, 8 January 2013‎ Rainwarrior talk contribs‎ 15,162 bytes +145‎ →‎split X scroll: hblank is not an option for this
• curprev 13:0713:07, 8 January 2013‎ Rainwarrior talk contribs‎ m 15,017 bytes 0‎ →‎Explanation: capitalization
• curprev 11:5811:58, 8 January 2013‎ Rainwarrior talk contribs‎ m 15,017 bytes +108‎ →‎Design: renaming Explanation, revising a little
• curprev 11:4711:47, 8 January 2013‎ Rainwarrior talk contribs‎ 14,909 bytes +2,085‎ →‎Stuff that affects register contents: notes explaining design/function
• curprev 11:0811:08, 8 January 2013‎ Rainwarrior talk contribs‎ m 12,824 bytes +172‎ minor tweaks
• curprev 10:5910:59, 8 January 2013‎ Rainwarrior talk contribs‎ m 12,652 bytes −10‎ →‎Wrapping around: "obviously" only really obvious when you already know the answer
• curprev 10:5410:54, 8 January 2013‎ Rainwarrior talk contribs‎ 12,662 bytes +190‎ renaming '1st' toggle register 'w', adding it to the list of side effects of various reads/writes, adding $2002 read to list
• curprev 10:3610:36, 8 January 2013‎ Rainwarrior talk contribs‎ m 12,472 bytes +31‎ →‎split X/Y scroll: "only the last write matters" seems ambiguous, clarifying
• curprev 10:3510:35, 8 January 2013‎ Rainwarrior talk contribs‎ m 12,441 bytes 0‎ →‎split X/Y scroll: % was stuck in green field
• curprev 10:3010:30, 8 January 2013‎ Rainwarrior talk contribs‎ 12,441 bytes +1,120‎ →‎split X/Y scroll: clarifying where the data goes, revising example for utility
• curprev 09:5509:55, 8 January 2013‎ Rainwarrior talk contribs‎ m 11,321 bytes +48‎ →‎Stuff that affects register contents: nintendulators dot counts are off by one from this, presuming behaviour is at dot 250 (251 in nintendulator), also linking to wrapping behaviour
• curprev 09:5109:51, 8 January 2013‎ Rainwarrior talk contribs‎ m 11,273 bytes +1‎ →‎PPU registers: latch -> toggle for consistency with rest of document
• curprev 09:4909:49, 8 January 2013‎ Rainwarrior talk contribs‎ 11,272 bytes +31‎ →‎Stuff that affects register contents: formatting, adding $2007 side effect on v
• curprev 09:4209:42, 8 January 2013‎ Rainwarrior talk contribs‎ 11,241 bytes +581‎ →‎Stuff that affects register contents: v is also Y-scroll incremented near the end of a scanline?
• curprev 09:1209:12, 8 January 2013‎ Rainwarrior talk contribs‎ m 10,660 bytes −71‎ →‎single scroll: rm typo
• curprev 09:0209:02, 8 January 2013‎ Rainwarrior talk contribs‎ 10,731 bytes +423‎ →‎split X/Y scroll: note about timing
• curprev 08:5908:59, 8 January 2013‎ Rainwarrior talk contribs‎ 10,308 bytes +2,294‎ →‎Examples: simpler examples where Y scrolling is not needed
• curprev 08:2608:26, 8 January 2013‎ Rainwarrior talk contribs‎ 8,014 bytes −3,834‎ →‎Examples: removing original example which does not properly set fine Y
• curprev 08:2108:21, 8 January 2013‎ Rainwarrior talk contribs‎ m 11,848 bytes −168‎ →‎Examples: do not need this note anymore (example has been corrected)
• curprev 08:2008:20, 8 January 2013‎ Rainwarrior talk contribs‎ m 12,016 bytes +7‎ →‎Stuff that affects register contents: formatting, missed a bit in = t:
• curprev 08:1908:19, 8 January 2013‎ Rainwarrior talk contribs‎ m 12,009 bytes 0‎ →‎Stuff that affects register contents: 15 bit registers, not 16
• curprev 08:1808:18, 8 January 2013‎ Rainwarrior talk contribs‎ m 12,009 bytes 0‎ →‎Examples: bit 14 of t is cleared by $2006 write, there is no bit 15

21 December 2012

• curprev 18:3418:34, 21 December 2012‎ Tepples talk contribs‎ m 12,009 bytes +18‎ →‎PPU registers: make PPU scrolling easier to find

28 September 2012

• curprev 15:3815:38, 28 September 2012‎ Tepples talk contribs‎ 11,991 bytes +12‎ →‎PPU registers: clarification per PM from Movax12

27 September 2012

• curprev 17:5917:59, 27 September 2012‎ Tepples talk contribs‎ 11,979 bytes +270‎ →‎PPU registers: clarified that this isn't needed for simple behavior, per tokumaru's request at http://forums.nesdev.com/viewtopic.php?p=100341#p100341

1 September 2012

• curprev 14:3214:32, 1 September 2012‎ Tepples talk contribs‎ m 11,709 bytes −20‎ Parodius Da? more like Parodius DEL

2 June 2012

• curprev 22:1022:10, 2 June 2012‎ Zepper talk contribs‎ m 11,729 bytes 0‎ →‎H position reset: someone said at dot 256... so I changed it.
• curprev 16:0116:01, 2 June 2012‎ Tepples talk contribs‎ 11,729 bytes +151‎ →‎Stuff that affects register contents: Vramaddr.jpg by Quietust
• curprev 07:4807:48, 2 June 2012‎ Koitsu talk contribs‎ 11,578 bytes +159‎ →‎Examples

1 June 2012

• curprev 21:3521:35, 1 June 2012‎ Zepper talk contribs‎ m 11,419 bytes −4‎ on scanline -1, v= t at dot 304, plus dot 258 copies the H position bits, AFAIK.
• curprev 16:2516:25, 1 June 2012‎ Koitsu talk contribs‎ 11,423 bytes +989‎ →‎2006-2005-2005-2006 example
• curprev 14:0814:08, 1 June 2012‎ Koitsu talk contribs‎ 10,434 bytes +1,965‎ →‎2006-2005-2005-2006 example
• curprev 13:4713:47, 1 June 2012‎ Koitsu talk contribs‎ 8,469 bytes +5,009‎ No edit summary
• curprev 11:1511:15, 1 June 2012‎ Tepples talk contribs‎ 3,460 bytes 0‎ →‎Stuff that affects register contents: clarify that all three bits of X are changed
• curprev 10:4610:46, 1 June 2012‎ Tepples talk contribs‎ 3,460 bytes +50‎ →‎Stuff that affects register contents: clarification request at http://nesdev.parodius.com/bbs/viewtopic.php?p=94887#94887

6 May 2012

• curprev 19:3819:38, 6 May 2012‎ Tepples talk contribs‎ 3,410 bytes +40‎ lead: "the address"

18 October 2011

• curprev 15:0615:06, 18 October 2011‎ Tepples talk contribs‎ 3,370 bytes −1‎ →‎Stuff that affects register contents: this was backward (in my own addition)
• curprev 12:3012:30, 18 October 2011‎ Tepples talk contribs‎ 3,371 bytes +3,371‎ written by loopy, very gently reformatted by me