PPU OAM: Revision history

22 December 2023

• curprev 03:2203:22, 22 December 2023‎ TakuikaNinja talk contribs‎ 10,526 bytes +27‎ 8x16 sprites are enabled using PPUCTRL.

13 April 2023

• curprev 06:2006:20, 13 April 2023‎ Fiskbit talk contribs‎ 10,499 bytes +4‎ Changes 'sprite zero' to 'sprite 0' for consistency and thus searchability.

17 February 2023

• curprev 03:3703:37, 17 February 2023‎ Jeffythedragonslayer talk contribs‎ 10,495 bytes +36‎ more obvious that to hide a sprite, don't copy from $00EF-$00FF of ram and write it to byte 0

15 February 2023

• curprev 12:1812:18, 15 February 2023‎ Fiskbit talk contribs‎ 10,459 bytes +236‎ →‎Dynamic RAM decay: org's analysis of PAL forced OAM refresh matches testing in Sour's thread: refresh begins on scanline 265.

23 January 2023

• curprev 17:1717:17, 23 January 2023‎ Fiskbit talk contribs‎ 10,223 bytes −38‎ Removes link to the now-deleted Chinese version of the page, which was almost entirely English.

19 April 2022

• curprev 14:0914:09, 19 April 2022‎ Tepples talk contribs‎ 10,261 bytes +156‎ →‎Byte 2: Unused and decayed bits read back 0 because of DRAM controller's data bus precharge

25 September 2020

• curprev 19:3019:30, 25 September 2020‎ Lidnariq talk contribs‎ 10,105 bytes −45‎ fix other link to sfc wiki; protocol-relative all links
• curprev 14:4214:42, 25 September 2020‎ Quietust talk contribs‎ m 10,150 bytes +3‎ →‎Dynamic RAM decay
• curprev 08:0008:00, 25 September 2020‎ はるき talk contribs‎ m 10,147 bytes −46‎ Fixed link to unofficial sprite sizes on wiki.superfamicom.org

7 May 2020

• curprev 07:1807:18, 7 May 2020‎ Fiskbit talk contribs‎ 10,193 bytes +146‎ Updates PAL OAM refresh timing to reflect more recent testing.

15 December 2018

• curprev 18:1818:18, 15 December 2018‎ Qalle talk contribs‎ m 10,047 bytes +38‎ →‎See also: link to orphaned page

10 September 2018

• curprev 20:3320:33, 10 September 2018‎ Koitsu talk contribs‎ 10,009 bytes +10‎ →‎Dynamic RAM decay
• curprev 19:4119:41, 10 September 2018‎ Lidnariq talk contribs‎ 9,999 bytes −24‎ →‎Dynamic RAM decay: divide each clause to make the description less garden-path-ly. Also move it after all the other details that only pertain to the 2C02. And imply that the UM6538 may not work the same as either.

17 October 2016

• curprev 17:1017:10, 17 October 2016‎ Rainwarrior talk contribs‎ m 10,023 bytes +11‎ →‎Dynamic RAM decay: fix sentence garbled by editing
• curprev 05:2305:23, 17 October 2016‎ Rainwarrior talk contribs‎ m 10,012 bytes +79‎ →‎Dynamic RAM decay: clarify that decay is only possible on NTSC
• curprev 05:1905:19, 17 October 2016‎ Rainwarrior talk contribs‎ 9,933 bytes +184‎ →‎Dynamic RAM decay: found thefox's post about PAL PPU
• curprev 05:0805:08, 17 October 2016‎ Rainwarrior talk contribs‎ 9,749 bytes +2,075‎ beginning description of OAM decay, still need to find some citations for PAL behaviour

6 September 2016

• curprev 17:3717:37, 6 September 2016‎ Rainwarrior talk contribs‎ m 7,674 bytes +26‎ →‎See also: more prominent link to PPU sprite priority

21 May 2015

• curprev 17:5717:57, 21 May 2015‎ Rainwarrior talk contribs‎ 7,648 bytes +9‎ →‎Sprite zero hits: "pixel values" is very ambiguous, should it say "colors"? the palette example seems a little muddled too, attempting revision
• curprev 17:3717:37, 21 May 2015‎ Rainwarrior talk contribs‎ 7,639 bytes +11‎ →‎Sprite zero hits: overscan is a more appropriate explaining link than clock rate
• curprev 03:4003:40, 21 May 2015‎ Tepples talk contribs‎ 7,628 bytes +21‎ →‎Sprite zero hits: citation per request on talk

20 May 2015

• curprev 22:1322:13, 20 May 2015‎ Tepples talk contribs‎ 7,607 bytes +122‎ →‎Sprite zero hits: The "regardless" list has concrete examples because they help emulator authors internalize the actual behavior.
• curprev 16:3816:38, 20 May 2015‎ Lidnariq talk contribs‎ 7,485 bytes +219‎ →‎Sprite zero hits: Undo. Mostly restore the "useless and not understandable "counter examples""—I strongly disagree
• curprev 16:3316:33, 20 May 2015‎ Rainwarrior talk contribs‎ 7,266 bytes −82‎ →‎Byte 3: removing accidental Bregalad signature
• curprev 16:3216:32, 20 May 2015‎ Rainwarrior talk contribs‎ 7,348 bytes +30‎ →‎DMA: DMA from ROM is useful for static screens (I do this for simple demos)
• curprev 14:2114:21, 20 May 2015‎ Bregalad talk contribs‎ 7,318 bytes −37‎ →‎Sprite zero hits: No need to say the same thing twice in a row
• curprev 14:1714:17, 20 May 2015‎ Bregalad talk contribs‎ 7,355 bytes +264‎ →‎Byte 3: Try to make this explaination suck less
• curprev 14:0814:08, 20 May 2015‎ Bregalad talk contribs‎ 7,091 bytes −66‎ →‎DMA: Makes it a tad clearer
• curprev 14:0414:04, 20 May 2015‎ Bregalad talk contribs‎ m 7,157 bytes +40‎ →‎Sprite zero hits: what matters is that pixel value is not %00
• curprev 13:2013:20, 20 May 2015‎ Bregalad talk contribs‎ 7,117 bytes −229‎ →‎Sprite zero hits: Removal of useless and not understandable "counter examples"

5 May 2015

• curprev 02:4302:43, 5 May 2015‎ Rainwarrior talk contribs‎ m 7,346 bytes +3‎ →‎Sprite zero hits: indicating binary numbers with %

4 May 2015

• curprev 03:2903:29, 4 May 2015‎ Tepples talk contribs‎ 7,343 bytes +58‎ →‎Sprite zero hits: Something could be understood the opposite of how it was intended
• curprev 03:2103:21, 4 May 2015‎ Tepples talk contribs‎ 7,285 bytes +713‎ →‎Sprite zero hits: Complete rewrite as a list of things that do and do not prevent it

3 May 2015

• curprev 17:4517:45, 3 May 2015‎ Rainwarrior talk contribs‎ m 6,572 bytes +4‎ reverting zero > #0, reason: if you're going to change notation be consistent about it (i.e. all or none), also why #? it's certainly not an assembly immediate prefix, so the # doesn't seem to add any important meaning?

2 May 2015

• curprev 19:1919:19, 2 May 2015‎ Koitsu talk contribs‎ 6,568 bytes 0‎ →‎Internal operation
• curprev 19:1919:19, 2 May 2015‎ Koitsu talk contribs‎ 6,568 bytes −4‎ →‎Sprite zero hits

24 March 2015

• curprev 23:5623:56, 24 March 2015‎ Rainwarrior talk contribs‎ m 6,572 bytes −18‎ →‎Internal operation: image diagram is part of a larger article on frame timing (we shouldn't substitute image for article)

23 March 2015

• curprev 20:0620:06, 23 March 2015‎ Koitsu talk contribs‎ 6,590 bytes −11‎ No edit summary

16 March 2015

• curprev 02:3302:33, 16 March 2015‎ Koitsu talk contribs‎ 6,601 bytes +5‎ →‎DMA
• curprev 02:2602:26, 16 March 2015‎ Koitsu talk contribs‎ 6,596 bytes +8‎ →‎Sprite zero hits
• curprev 02:2602:26, 16 March 2015‎ Koitsu talk contribs‎ 6,588 bytes +8‎ →‎Sprite zero hits
• curprev 02:2602:26, 16 March 2015‎ Koitsu talk contribs‎ 6,580 bytes +20‎ No edit summary

14 March 2015

• curprev 01:2501:25, 14 March 2015‎ Lidnariq talk contribs‎ 6,560 bytes −138‎ use convenience redirects

12 November 2014

• curprev 04:3704:37, 12 November 2014‎ Koitsu talk contribs‎ 6,698 bytes +28‎ No edit summary

16 October 2014

• curprev 16:5316:53, 16 October 2014‎ Koitsu talk contribs‎ m 6,670 bytes +1‎ →‎Byte 3

22 July 2013

• curprev 03:3303:33, 22 July 2013‎ Tepples talk contribs‎ 6,669 bytes +136‎ →‎Byte 0: I'm working on a tool to make a static downloadable version of the wiki, and when previewing its output, I come across things like this that aren't completely described where they should be

28 April 2013

• curprev 03:5503:55, 28 April 2013‎ Ulfalizer talk contribs‎ 6,533 bytes +384‎ Add some more sprite zero internals details

7 April 2013

• curprev 02:0202:02, 7 April 2013‎ Ulfalizer talk contribs‎ 6,149 bytes −76‎ Merge the notes into the description of byte 2

5 April 2013

• curprev 01:0401:04, 5 April 2013‎ Lidnariq talk contribs‎ m 6,225 bytes 0‎ →‎DMA: replace asterisk with multiplication symbol; fix typo.
• curprev 00:3900:39, 5 April 2013‎ Ulfalizer talk contribs‎ 6,225 bytes +394‎ Clarify internal operation and timing of DMA.

1 April 2013

• curprev 10:3210:32, 1 April 2013‎ Ulfalizer talk contribs‎ 5,831 bytes +371‎ Add information on how sprite zero hit detection works internally
• curprev 10:2310:23, 1 April 2013‎ Ulfalizer talk contribs‎ 5,460 bytes +43‎ Specify where the OAM memory is located.
• curprev 09:4309:43, 1 April 2013‎ Ulfalizer talk contribs‎ 5,417 bytes +191‎ Linkify some registers

28 March 2013

• curprev 09:3109:31, 28 March 2013‎ Ulfalizer talk contribs‎ 5,226 bytes 0‎ Rearrange "Internal operation" section slightly
• curprev 09:2809:28, 28 March 2013‎ Ulfalizer talk contribs‎ 5,226 bytes +26‎ Small internal operation clarification
• curprev 09:2709:27, 28 March 2013‎ Ulfalizer talk contribs‎ 5,200 bytes +374‎ Add some internal sprite priority details
• curprev 08:5408:54, 28 March 2013‎ Ulfalizer talk contribs‎ 4,826 bytes +11‎ Minor sprite zero clarifications
• curprev 08:5008:50, 28 March 2013‎ Ulfalizer talk contribs‎ 4,815 bytes +73‎ Clarify non-bg condition
• curprev 08:4508:45, 28 March 2013‎ Ulfalizer talk contribs‎ m 4,742 bytes −4‎ No edit summary
• curprev 08:3508:35, 28 March 2013‎ Ulfalizer talk contribs‎ 4,746 bytes +18‎ Rephrase sprite zero section to be a bit less awkward
• curprev 08:3008:30, 28 March 2013‎ Ulfalizer talk contribs‎ m 4,728 bytes +5‎ No edit summary
• curprev 08:2908:29, 28 March 2013‎ Ulfalizer talk contribs‎ 4,723 bytes +618‎ Add information on sprite zero hits (verified in Visual 2C02)

25 March 2013

• curprev 04:1804:18, 25 March 2013‎ Ulfalizer talk contribs‎ m 4,105 bytes +1‎ Fix typo
• curprev 03:5703:57, 25 March 2013‎ Ulfalizer talk contribs‎ 4,104 bytes +61‎ Clarify how DMA works
• curprev 03:5303:53, 25 March 2013‎ Ulfalizer talk contribs‎ 4,043 bytes +656‎ Add an overview of internal OAM operation

16 March 2013

• curprev 15:3615:36, 16 March 2013‎ Ulfalizer talk contribs‎ m 3,387 bytes +10‎ Make the difference between the NES and SNES vflip modes clearer.
• curprev 15:3515:35, 16 March 2013‎ Ulfalizer talk contribs‎ 3,377 bytes 0‎ Clarify vflip for 8x16 sprites.

3 February 2013

• curprev 00:3500:35, 3 February 2013‎ Zelex talk contribs‎ 3,377 bytes −1‎ →‎Sprite overlapping

28 May 2012

• curprev 20:1420:14, 28 May 2012‎ Tepples talk contribs‎ m 3,378 bytes −44‎ promoted PPU sprite priority to prose
• curprev 20:0620:06, 28 May 2012‎ Tepples talk contribs‎ 3,422 bytes +180‎ →‎Byte 2: further elaboration to address http://nesdev.parodius.com/bbs/viewtopic.php?p=94711#94711
• curprev 11:4511:45, 28 May 2012‎ Tepples talk contribs‎ 3,242 bytes +188‎ →‎Byte 1: clearer as to when $2000.D3 is used or ignored
• curprev 11:4111:41, 28 May 2012‎ Tepples talk contribs‎ 3,054 bytes +115‎ →‎Byte 2: clarified per

24 March 2012

• curprev 04:3404:34, 24 March 2012‎ Zepper talk contribs‎ m 2,939 bytes +18‎ →‎DMA

13 January 2011

• curprev 19:4819:48, 13 January 2011‎ Zepper talk contribs‎ m 2,921 bytes +115‎ →‎related links

11 January 2011

• curprev 22:2022:20, 11 January 2011‎ Tepples talk contribs‎ 2,806 bytes +391‎ →‎Byte 2: Vertical flip in 8x16
• curprev 20:0520:05, 11 January 2011‎ Tepples talk contribs‎ 2,415 bytes +43‎ →‎Notes: "the instruction" clarified
• curprev 20:0120:01, 11 January 2011‎ Tepples talk contribs‎ 2,372 bytes +35‎ →‎Notes: further clarification that this & 0xE3 operation is currently for emulators
• curprev 15:1915:19, 11 January 2011‎ Tepples talk contribs‎ 2,337 bytes +295‎ qualify statement based on http://nesdev.parodius.com/bbs/viewtopic.php?p=72568#72568
• curprev 15:0315:03, 11 January 2011‎ Tepples talk contribs‎ 2,042 bytes +112‎ →‎Notes: masked: clearer as to which masking operation
• curprev 04:5404:54, 11 January 2011‎ Zepper talk contribs‎ m 1,930 bytes +76‎ Clarify 3rd byte and 2004 reads.
• curprev 04:5304:53, 11 January 2011‎ Zepper talk contribs‎ m 1,854 bytes −18‎ →‎Byte 2

6 December 2010

• curprev 20:1620:16, 6 December 2010‎ Tepples talk contribs‎ 1,872 bytes +171‎ →‎Sprite Overlapping: expand on last edit
• curprev 05:5705:57, 6 December 2010‎ 3GenGames talk contribs‎ 1,701 bytes +168‎ No edit summary

23 March 2010

• curprev 02:0302:03, 23 March 2010‎ Tepples talk contribs‎ 1,533 bytes +151‎ →‎Byte 3: Why use DMA and not STA $2004

19 March 2010

• curprev 20:0620:06, 19 March 2010‎ Tepples talk contribs‎ 1,382 bytes +203‎ →‎Byte 1: just in case it wasn't clear

11 June 2009

• curprev 07:1907:19, 11 June 2009‎ Banshaku talk contribs‎ m 1,179 bytes −10‎ →‎OAM

20 April 2009

• curprev 10:0710:07, 20 April 2009‎ Banshaku talk contribs‎ m 1,189 bytes −2‎ →‎OAM

17 April 2009

• curprev 08:1908:19, 17 April 2009‎ Banshaku talk contribs‎ m 1,191 bytes +12‎ No edit summary
• curprev 06:2806:28, 17 April 2009‎ Banshaku talk contribs‎ m 1,179 bytes −2‎ →‎OAM
• curprev 06:2806:28, 17 April 2009‎ Banshaku talk contribs‎ m 1,181 bytes +1,181‎ Created page with '=== OAM === OAM (Object Attribute Memory) contains a display list of up to 64 sprites, where each sprite's information occupies 4 bytes. === Byte 0 === Y position of top of spri...'