MMC5: Revision history

2 April 2024

• curprev 14:4814:48, 2 April 2024‎ Ben Boldt talk contribs‎ 46,918 bytes +220‎ →‎Scanline IRQ Status ($5204, read/write): Clarified that the scanline does not reset from a scanline interrupt.
• curprev 09:0709:07, 2 April 2024‎ Bregalad talk contribs‎ 46,698 bytes +192‎ Move the split mode info to the split mode registers. Separates frame and blanking data access in the table.
• curprev 07:3907:39, 2 April 2024‎ Ben Boldt talk contribs‎ 46,506 bytes +198‎ →‎Scanline Detection and Scanline IRQ: updated a couple things having to do with scanline counter resetting.
• curprev 07:2507:25, 2 April 2024‎ Ben Boldt talk contribs‎ 46,308 bytes +353‎ →‎PPU Data Substitution Enable ($2001 = PPUMASK): Added info about scanline counter.

1 April 2024

• curprev 20:5120:51, 1 April 2024‎ Bregalad talk contribs‎ 45,955 bytes +66‎ →‎Internal extended RAM mode ($5104): Mention we were talking about mode %01, mention the open bus.

30 March 2024

• curprev 04:2804:28, 30 March 2024‎ Ben Boldt talk contribs‎ 45,889 bytes +251‎ →‎Internal extended RAM mode ($5104): Improved connection between PPU address and CPU address for extended RAM data.

29 March 2024

• curprev 22:5522:55, 29 March 2024‎ Bregalad talk contribs‎ m 45,638 bytes 0‎ →‎Internal extended RAM mode ($5104): My previous edit screw up the order of the info, this edit fixes it.
• curprev 13:0513:05, 29 March 2024‎ Ben Boldt talk contribs‎ m 45,638 bytes +7‎ →‎Vertical Split Mode ($5200)
• curprev 12:5912:59, 29 March 2024‎ Ben Boldt talk contribs‎ 45,631 bytes +849‎ →‎Vertical Split Mode ($5200): Improved description, fixed problems where I was saying that the MMC5 substitutes pattern data.

28 March 2024

• curprev 08:2908:29, 28 March 2024‎ Bregalad talk contribs‎ 44,782 bytes +32‎ Oops, better sorting of the info between footnote and extended attribute mode
• curprev 08:2308:23, 28 March 2024‎ Bregalad talk contribs‎ 44,750 bytes −112‎ →‎Internal extended RAM mode ($5104): Avoids to tell the same thing twice, removed the incorrect info of extended attribute being 4-screen mirrored when it is actually single-screen mirrored

27 March 2024

• curprev 03:4503:45, 27 March 2024‎ Ben Boldt talk contribs‎ m 44,862 bytes +89‎ →‎MMC5A
• curprev 03:3703:37, 27 March 2024‎ Ben Boldt talk contribs‎ 44,773 bytes +429‎ →‎MMC5A Registers: Corrected errors related to register $5207.
• curprev 00:3200:32, 27 March 2024‎ Ben Boldt talk contribs‎ m 44,344 bytes +7‎ →‎Nametable mapping ($5105)
• curprev 00:1900:19, 27 March 2024‎ Ben Boldt talk contribs‎ 44,337 bytes +759‎ →‎Internal extended RAM mode ($5104): Updated description detailing what happens when assigning ExRAM as nametable when extended attributes are enabled.

26 March 2024

• curprev 21:5821:58, 26 March 2024‎ Ben Boldt talk contribs‎ 43,578 bytes +71‎ →‎Scanline IRQ Status ($5204, read/write): Pin 92 low disables scanline IRQs.
• curprev 21:5421:54, 26 March 2024‎ Ben Boldt talk contribs‎ 43,507 bytes +355‎ →‎8x16 PPU Sequence Monitoring Enable ($2001 = PPUMASK)
• curprev 21:3521:35, 26 March 2024‎ Ben Boldt talk contribs‎ 43,152 bytes +319‎ →‎NES internal state monitoring: Corresponding update to description of $2001. I need to check if scanline IRQs get disabled this way as well.
• curprev 21:2421:24, 26 March 2024‎ Ben Boldt talk contribs‎ 42,833 bytes +135‎ →‎Internal extended RAM mode ($5104): Added PPUMASK info for extended attribute mode.
• curprev 21:2121:21, 26 March 2024‎ Ben Boldt talk contribs‎ 42,698 bytes +101‎ →‎Vertical Split Mode ($5200): I found that vertical split mode is disabled by PPUMASK monitoring, similar as 8x16 sprite mode.
• curprev 02:2002:20, 26 March 2024‎ Ben Boldt talk contribs‎ 42,597 bytes +115‎ →‎Vertical Split Mode ($5200): More details, things that automatically disable split mode.
• curprev 02:1402:14, 26 March 2024‎ Ben Boldt talk contribs‎ 42,482 bytes +40‎ →‎Vertical Split Mode ($5200): Pin 92 low disables split mode.
• curprev 01:5301:53, 26 March 2024‎ Ben Boldt talk contribs‎ m 42,442 bytes +9‎ →‎Internal extended RAM mode ($5104)
• curprev 01:5301:53, 26 March 2024‎ Ben Boldt talk contribs‎ 42,433 bytes +346‎ →‎Internal extended RAM mode ($5104): I must have goofed something up before because I absolutely am not getting nametable data to work in mode %11. Tested and added split mode info.

25 March 2024

• curprev 22:1122:11, 25 March 2024‎ Ben Boldt talk contribs‎ m 42,087 bytes +474‎ →‎Vertical Split Mode ($5200): Additional cleanup.
• curprev 21:0521:05, 25 March 2024‎ Ben Boldt talk contribs‎ 41,613 bytes +411‎ →‎Vertical Split Mode ($5200): Clarifications as I am reading and remembering how this works. No new information in this edit.
• curprev 19:5419:54, 25 March 2024‎ Ben Boldt talk contribs‎ 41,202 bytes +130‎ →‎Fill-mode color ($5107): Fill mode color vs. pin 92 low when using extended attributes with fill mode.
• curprev 19:4619:46, 25 March 2024‎ Ben Boldt talk contribs‎ 41,072 bytes −278‎ →‎Configuration: removed incorrect statements that were caused by a test setup issue. My test waited for in-frame before doing these writes, so the test itself got disabled with pin 92 low.
• curprev 19:1219:12, 25 March 2024‎ Ben Boldt talk contribs‎ 41,350 bytes +13‎ →‎Internal extended RAM mode ($5104): additional note clarifying that extended ram writes via ppudata does not become available when pin 92 is driven low. I.e. pin 92 low is not just pretending to be in a different mode.
• curprev 19:0619:06, 25 March 2024‎ Ben Boldt talk contribs‎ 41,337 bytes +84‎ →‎Internal extended RAM mode ($5104): pin 92 low prevents write access to $5C00
• curprev 08:3508:35, 25 March 2024‎ Ben Boldt talk contribs‎ 41,253 bytes +320‎ →‎Fill-mode color ($5107): added more fill mode info.
• curprev 03:2403:24, 25 March 2024‎ Ben Boldt talk contribs‎ 40,933 bytes +201‎ →‎Internal extended RAM mode ($5104): Writing during v-blank in modes 00,01 is not writing zeros for me. It either doesn’t write or it corrupts it.
• curprev 02:2002:20, 25 March 2024‎ Ben Boldt talk contribs‎ 40,732 bytes +41‎ →‎Nametable mapping ($5105)
• curprev 02:1502:15, 25 March 2024‎ Ben Boldt talk contribs‎ m 40,691 bytes 0‎ →‎Internal extended RAM mode ($5104)
• curprev 02:1202:12, 25 March 2024‎ Ben Boldt talk contribs‎ 40,691 bytes +466‎ →‎Internal extended RAM mode ($5104): Details added for $5104 register. Testing revealed that mode 11 does work as a read-only nametable.
• curprev 01:3601:36, 25 March 2024‎ Ben Boldt talk contribs‎ 40,225 bytes +64‎ →‎Scanline IRQ Status ($5204, read/write): pin 92 info

24 March 2024

• curprev 21:1421:14, 24 March 2024‎ Ben Boldt talk contribs‎ 40,161 bytes +137‎ →‎Scanline IRQ Status ($5204, read/write): In-frame bit clarification. I think we knew this already but I did test to confirm the h-blank. I did a test program that reads $5204, ROL*3, write to $4016, then watched OUT0 with a scope.

31 December 2023

• curprev 03:1603:16, 31 December 2023‎ Ben Boldt talk contribs‎ m 40,024 bytes 0‎ →‎PRG Bankswitching ($5113-$5117): Made example select ROM since 10 was larger than possible for RAM.

30 December 2023

• curprev 00:3900:39, 30 December 2023‎ Ben Boldt talk contribs‎ 40,024 bytes +6,269‎ →‎PRG Bankswitching ($5113-$5117): Bankswitch register clarification. No new info; just trying to explain it better.

18 January 2023

• curprev 00:0300:03, 18 January 2023‎ Rainwarrior talk contribs‎ 33,755 bytes +1‎ Internal extended RAM section is not part of MMC5A

17 January 2023

• curprev 23:4823:48, 17 January 2023‎ Rainwarrior talk contribs‎ m 33,754 bytes +11‎ quick link to MMC5A from lead
• curprev 23:4723:47, 17 January 2023‎ Rainwarrior talk contribs‎ 33,743 bytes +173‎ →‎MMC5A Only: create an MMC5 section for the article to hoist it up as a visible heading and make the division a little clearer
• curprev 23:4323:43, 17 January 2023‎ Rainwarrior talk contribs‎ 33,570 bytes +168‎ mention MMC5A's unused feature status in lead

27 October 2022

• curprev 03:4203:42, 27 October 2022‎ Ben Boldt talk contribs‎ m 33,402 bytes −254‎ →‎Scanline Detection and Scanline IRQ: Removed the last paragraph about reset detection, which was already explained farther up.

5 October 2022

• curprev 21:3421:34, 5 October 2022‎ Rainwarrior talk contribs‎ 33,656 bytes +53‎ →‎Vertical Split Scroll ($5201): note that SL mode is unused

9 August 2022

• curprev 21:2121:21, 9 August 2022‎ Ben Boldt talk contribs‎ m 33,603 bytes −2‎ →‎Internal extended RAM mode ($5104): Removed unnecessary "1=" from table.

27 June 2022

• curprev 13:5813:58, 27 June 2022‎ Ben Boldt talk contribs‎ m 33,605 bytes −43‎ →‎Upper CHR Bank bits ($5130): cleanup
• curprev 03:4403:44, 27 June 2022‎ Ben Boldt talk contribs‎ 33,648 bytes −50‎ →‎Fill-mode tile ($5106): I remembered asking about this in the forum. I updated this with what I learned there.
• curprev 03:3203:32, 27 June 2022‎ Ben Boldt talk contribs‎ m 33,698 bytes +3‎ →‎Fill-mode color ($5107): fixed a typo
• curprev 01:3101:31, 27 June 2022‎ Ben Boldt talk contribs‎ 33,695 bytes +1,641‎ Reorganized and clarified information about extended RAM mode.