Controller reading code: Revision history

23 August 2024

• curprev 07:1607:16, 23 August 2024‎ Fiskbit talk contribs‎ 18,975 bytes +15‎ →‎DPCM Safety: Clarifies that more than 1 bit may be deleted (Famicoms delete up to 3). Makes a less-sweeping claim about modern emulators supporting synced reads; for example, puNES currently deletes bits but has bad DMA timings that break sync.

15 March 2024

• curprev 15:5415:54, 15 March 2024‎ Fiskbit talk contribs‎ 18,960 bytes +773‎ Adds a cycle count table for various DMC DMA cases to the synced reads section. This is more relevant and less misleading here than on the APU DMC page.

14 January 2024

• curprev 00:0800:08, 14 January 2024‎ Fiskbit talk contribs‎ 18,187 bytes +109‎ →‎DPCM Safety using Repeated Reads: Explains why repeated reads have a cycle budget.

13 January 2024

• curprev 09:5909:59, 13 January 2024‎ Fiskbit talk contribs‎ 18,078 bytes +30‎ Notes that the DPCM bug is fixed on PAL.
• curprev 09:5309:53, 13 January 2024‎ Fiskbit talk contribs‎ 18,048 bytes +4,825‎ Adds a DPCM Safety preamble explaining the bug and limitations common to all approaches. Adds (comprehensive?) pros and cons for each approach. Cleans up the synced reads explanation.

12 January 2024

• curprev 19:2119:21, 12 January 2024‎ Rainwarrior talk contribs‎ 13,223 bytes +492‎ →‎Directional Safety: trying to improve the commentary on this, why it might be used
• curprev 19:0819:08, 12 January 2024‎ Rainwarrior talk contribs‎ 12,731 bytes 0‎ →‎Other Useful Operations: reversing the order of the 3 examples (i think they were in reverse order of usefulness)
• curprev 19:0519:05, 12 January 2024‎ Rainwarrior talk contribs‎ m 12,731 bytes +46‎ →‎Calculating Presses and Releases: note that we need the last frame's buttons are part of the explanation
• curprev 19:0419:04, 12 January 2024‎ Rainwarrior talk contribs‎ m 12,685 bytes +1‎ →‎Calculating Presses and Releases: a newline probably makes this more legible
• curprev 19:0319:03, 12 January 2024‎ Rainwarrior talk contribs‎ 12,684 bytes +127‎ →‎Calculating Presses and Releases: put this example in the order it was described, add an annotation of what the operation is doing
• curprev 18:5618:56, 12 January 2024‎ Rainwarrior talk contribs‎ m 12,557 bytes +18‎ →‎DPCM Safety using OAM DMA: adaptation for longer report is not trival, so make sure to point out the notes below
• curprev 18:5518:55, 12 January 2024‎ Rainwarrior talk contribs‎ m 12,539 bytes +18‎ consistent x index notation
• curprev 18:5318:53, 12 January 2024‎ Rainwarrior talk contribs‎ m 12,521 bytes −25‎ →‎DPCM Safety using OAM DMA: use same buttons/loop convention as other examples
• curprev 18:4218:42, 12 January 2024‎ Rainwarrior talk contribs‎ 12,546 bytes +62‎ add higher level groups for "controller reading code" and "other useful operations"
• curprev 18:4018:40, 12 January 2024‎ Rainwarrior talk contribs‎ 12,484 bytes +452‎ →‎DPCM Safety using OAM DMA: note that this might be ideal, but has the synchronization constraint
• curprev 18:2518:25, 12 January 2024‎ Rainwarrior talk contribs‎ 12,032 bytes +128‎ →‎External Examples: link tepples' nrom-template example

11 January 2024

• curprev 02:0002:00, 11 January 2024‎ Rainwarrior talk contribs‎ 11,904 bytes 0‎ →‎Basic Example: replace tab with spaces for alignment
• curprev 01:5801:58, 11 January 2024‎ Rainwarrior talk contribs‎ m 11,904 bytes −18‎ examples now use "buttons", not "buttons1, buttons2"
• curprev 01:3801:38, 11 January 2024‎ TakuikaNinja talk contribs‎ 11,922 bytes +145‎ Add reference to the TAS which first demonstrated abusing the controller reread loop.
• curprev 01:3201:32, 11 January 2024‎ Rainwarrior talk contribs‎ m 11,777 bytes +1‎ →‎DPCM Safety using Repeated Reads: fix arstechnica link
• curprev 01:3101:31, 11 January 2024‎ Rainwarrior talk contribs‎ 11,776 bytes +261‎ →‎Standard Read for 2 Controllers and Famicom: footnote about why the AND can't be skipped
• curprev 01:2301:23, 11 January 2024‎ Rainwarrior talk contribs‎ m 11,515 bytes −1‎ →‎Standard Read for 2 Controllers and Famicom: double bracket
• curprev 01:2101:21, 11 January 2024‎ Rainwarrior talk contribs‎ 11,516 bytes +12‎ →‎DPCM Safety using Repeated Reads: use fall through
• curprev 01:1901:19, 11 January 2024‎ Rainwarrior talk contribs‎ m 11,504 bytes 0‎ →‎Alternative 2 Controllers Read: fix +9=+0 typo
• curprev 01:1901:19, 11 January 2024‎ Rainwarrior talk contribs‎ 11,504 bytes +489‎ →‎DPCM Safety using Repeated Reads: finishing note about SMB3, will resolve edit conflict in the next edit
• curprev 01:1401:14, 11 January 2024‎ TakuikaNinja talk contribs‎ 11,015 bytes −29‎ Move 2 controller reread note into a proper warning box.
• curprev 01:0601:06, 11 January 2024‎ TakuikaNinja talk contribs‎ 11,044 bytes +76‎ Fix code typos and make readjoy2_safe use the same fall through from readjoyx2.
• curprev 01:0101:01, 11 January 2024‎ Rainwarrior talk contribs‎ 10,968 bytes −25‎ →‎DPCM Safety using Repeated Reads: this is now a 2 controller example
• curprev 00:5600:56, 11 January 2024‎ Rainwarrior talk contribs‎ m 10,993 bytes +1‎ →‎Basic Example: fix link
• curprev 00:5600:56, 11 January 2024‎ Rainwarrior talk contribs‎ 10,992 bytes +853‎ Break up the 3 examples to make them easier to follow
• curprev 00:4300:43, 11 January 2024‎ Rainwarrior talk contribs‎ 10,139 bytes +150‎ →‎DPCM Safety using Repeated Reads: use readjoyx to make 2 controllers simple
• curprev 00:4000:40, 11 January 2024‎ Rainwarrior talk contribs‎ 9,989 bytes +239‎ →‎Basic Example: note that this second routine is safe for NES too
• curprev 00:3700:37, 11 January 2024‎ Rainwarrior talk contribs‎ 9,750 bytes +394‎ →‎Basic Example: create a more standard example to read one controller at a time via index

16 November 2023

• curprev 04:2804:28, 16 November 2023‎ Rainwarrior talk contribs‎ 9,356 bytes +426‎ →‎DPCM Safety using Repeated Reads: note the timing restrictions, reference the gimmick bug as a cautionary example
• curprev 04:2104:21, 16 November 2023‎ Rainwarrior talk contribs‎ 8,930 bytes +1‎ →‎Basic Example: readjoy is referred to below and having two non-equivalent functions with the same name makes this confusing, renaming the double read to readjoy2

14 November 2023

• curprev 12:3112:31, 14 November 2023‎ Fiskbit talk contribs‎ 8,929 bytes +16‎ →‎DPCM Safety using OAM DMA: Clarifies that the three writes when an interrupt occurs are the stack writes.

25 February 2023

• curprev 17:3117:31, 25 February 2023‎ Jroweboy talk contribs‎ 8,913 bytes +174‎ Clarify that controller1 and controller2 are assumed to be in the zeropage for the OAM DPCM synced controller read example code.

6 February 2023

• curprev 12:3412:34, 6 February 2023‎ Fiskbit talk contribs‎ 8,739 bytes +527‎ Replaces even/odd cycle terminology with get/put. Adds more relevant caveats. Links to new DMA page.

6 January 2021

• curprev 23:3823:38, 6 January 2021‎ Rainwarrior talk contribs‎ 8,212 bytes +51‎ →‎DPCM Safety using OAM DMA: point out that page crossing will fail this
• curprev 23:3623:36, 6 January 2021‎ Rainwarrior talk contribs‎ 8,161 bytes −340‎ →‎DPCM Safety using Repeated Reads: Removing suggestion to add a full frame of lag as a tradeoff.

10 December 2019

• curprev 07:5107:51, 10 December 2019‎ Rainwarrior talk contribs‎ 8,501 bytes +137‎ →‎DPCM Safety using OAM DMA: more specific instructions about what to align
• curprev 07:4807:48, 10 December 2019‎ Rainwarrior talk contribs‎ 8,364 bytes +572‎ →‎DPCM Safety using OAM DMA: note and link Fiskbit's ROL caveat

20 April 2019

• curprev 23:2723:27, 20 April 2019‎ Rainwarrior talk contribs‎ m 7,792 bytes −7‎ →‎Basic Example: moved to Controller reading
• curprev 22:2022:20, 20 April 2019‎ Rainwarrior talk contribs‎ m 7,799 bytes +34‎ linking Controller reading for reference
• curprev 22:1922:19, 20 April 2019‎ Rainwarrior talk contribs‎ 7,765 bytes +69‎ brief lead
• curprev 22:1322:13, 20 April 2019‎ Rainwarrior talk contribs‎ m 7,696 bytes 0‎ Rainwarrior moved page Controller Reading to Controller reading code: Separating code examples to make a page just about the controller read interface that is common to all input

16 April 2019

• curprev 19:1419:14, 16 April 2019‎ Rainwarrior talk contribs‎ 7,696 bytes −705‎ →‎DPCM Safety using Repeated Reads: moving the last frame compromise code to Talk
• curprev 18:5218:52, 16 April 2019‎ Rainwarrior talk contribs‎ 8,401 bytes +21‎ →‎DPCM Safety using Repeated Reads: move the note above the compromised optimization to explain what you're trading away for saving a few cycles
• curprev 18:5018:50, 16 April 2019‎ Rainwarrior talk contribs‎ 8,380 bytes +272‎ →‎DPCM Safety using Repeated Reads: this describes a simple example but omits code for it, then jumps into a more complicated optimization/compromise example? adding the simple case first

14 December 2018

• curprev 22:5622:56, 14 December 2018‎ Qalle talk contribs‎ 8,108 bytes −8‎ →‎Directional Safety: fix diagonals code, indentation