VRC7 audio: Revision history

19 June 2023

• curprev 02:4102:41, 19 June 2023‎ Lidnariq talk contribs‎ 16,869 bytes +141‎ →‎Differences from OPLL: should link to the VRC7 vs YM2413 recording

10 August 2022

• curprev 03:2503:25, 10 August 2022‎ Quietust talk contribs‎ m 16,728 bytes +8‎ →‎Debug Mode: spacing

9 August 2022

• curprev 21:1921:19, 9 August 2022‎ Ben Boldt talk contribs‎ m 16,720 bytes −216‎ →‎Debug Mode: Remove unnecessary "1=" from table.

31 July 2022

• curprev 20:1020:10, 31 July 2022‎ Lidnariq talk contribs‎ 16,936 bytes +284‎ →‎Debug Mode
• curprev 19:5219:52, 31 July 2022‎ Lidnariq talk contribs‎ 16,652 bytes +341‎ →‎Debug Mode: add interpretation instructions for "instrom" lines

30 July 2022

• curprev 23:5023:50, 30 July 2022‎ Quietust talk contribs‎ m 16,311 bytes 0‎ →‎Debug Mode
• curprev 17:5617:56, 30 July 2022‎ Quietust talk contribs‎ 16,311 bytes +898‎ →‎Debug Mode: Update to match Yuri213212's findings in Discord, and remove sortable flag because it doesn't really work anymore

28 July 2022

• curprev 02:4402:44, 28 July 2022‎ Lidnariq talk contribs‎ m 15,413 bytes −2‎ →‎Debug Mode: Q attests the upper 3/4 of the data bus is driven low strongly during "serial out" mode
• curprev 02:2202:22, 28 July 2022‎ Lidnariq talk contribs‎ 15,415 bytes +152‎ split "write regs" so that it explicitly maps to the $9010/$9030 registers above. also make table sortable
• curprev 01:2701:27, 28 July 2022‎ Quietust talk contribs‎ m 15,263 bytes +124‎ →‎Debug Mode
• curprev 01:2401:24, 28 July 2022‎ Quietust talk contribs‎ m 15,139 bytes 0‎ →‎Debug Mode: would want to hold PPU A13 high when writing registers, otherwise when M2 goes low it'll trigger "Set DAC"
• curprev 01:2301:23, 28 July 2022‎ Quietust talk contribs‎ 15,139 bytes −542‎ →‎Debug Mode: M2 was backwards, and some other details didn't line up with what I've traced in visualvrc7
• curprev 00:2900:29, 28 July 2022‎ Quietust talk contribs‎ 15,681 bytes −75‎ $E000.6 isn't a "silence" bit - it's a Reset signal
• curprev 00:2500:25, 28 July 2022‎ Quietust talk contribs‎ 15,756 bytes 0‎ →‎Debug Mode: "CPU A(n)" is pin 16, not pin 19

20 June 2022

• curprev 23:0423:04, 20 June 2022‎ Tepples talk contribs‎ 15,756 bytes +97‎ →‎Audio Register Write ($9030): VRC7 A5 == YM2413 A0
• curprev 20:1220:12, 20 June 2022‎ Ben Boldt talk contribs‎ 15,659 bytes +679‎ →‎Debug Mode: Added new information from SCSR.
• curprev 13:5813:58, 20 June 2022‎ Tepples talk contribs‎ 14,980 bytes +65‎ →‎Audio Enable ($E000): SCSR on Discord claims that writes to $9010 and $9030 are disregarded

17 June 2022

• curprev 18:5418:54, 17 June 2022‎ Ben Boldt talk contribs‎ 14,915 bytes 0‎ →‎Debug Mode: Inverted pin 15 (/Debug) in the debug mode input table, per SCSR on discord.
• curprev 18:1018:10, 17 June 2022‎ Ben Boldt talk contribs‎ 14,915 bytes +257‎ →‎Debug Mode: Added info about serial data from Discord.
• curprev 17:1517:15, 17 June 2022‎ Lidnariq talk contribs‎ 14,658 bytes −112‎ →‎Differences from OPLL: VRC7 has never had a singular "internal state output pin", where did that come from?
• curprev 16:4816:48, 17 June 2022‎ Ben Boldt talk contribs‎ m 14,770 bytes −24‎ →‎Debug Mode: Fixed silly mistake.
• curprev 16:4016:40, 17 June 2022‎ Ben Boldt talk contribs‎ 14,794 bytes +2,221‎ Added debug mode information from SCSR on discord.

1 May 2020

• curprev 20:0420:04, 1 May 2020‎ Ben Boldt talk contribs‎ 12,573 bytes +571‎ →‎Internal patch set: Added patch names from plgDavid's forum post. Also added info about hidden drum patches.

30 April 2020

• curprev 20:5120:51, 30 April 2020‎ Lidnariq talk contribs‎ 12,002 bytes +6‎ siliconpr0n wiki renamed the anchor

1 July 2019

• curprev 17:5217:52, 1 July 2019‎ Rainwarrior talk contribs‎ m 11,996 bytes +8‎ revise description of the earlier discovered LFO reset, since the test register is more effective for this purpose
• curprev 17:5017:50, 1 July 2019‎ Rainwarrior talk contribs‎ m 11,988 bytes 0‎ →‎Test Register $0F: fix ref tag
• curprev 17:5017:50, 1 July 2019‎ Rainwarrior talk contribs‎ 11,988 bytes +794‎ →‎Internal Audio Registers: document test register $0F
• curprev 16:2016:20, 1 July 2019‎ Tepples talk contribs‎ 11,194 bytes −100‎ Undo revision 16775 by Tepples (talk): It also affects 5B. The situation is more complex than I thought and must be clarified elsewhere.
• curprev 15:5415:54, 1 July 2019‎ Tepples talk contribs‎ 11,294 bytes +100‎ →‎Audio Enable ($E000): multichip effect

23 March 2019

• curprev 21:3121:31, 23 March 2019‎ Rainwarrior talk contribs‎ 11,194 bytes −129‎ →‎External links: deleting broken DOSBox OPL link
• curprev 21:3021:30, 23 March 2019‎ Rainwarrior talk contribs‎ 11,323 bytes +122‎ →‎External links: link to decap shots

19 March 2019

• curprev 22:0122:01, 19 March 2019‎ Rainwarrior talk contribs‎ 11,201 bytes +45‎ →‎Audio Enable ($E000): only resets tremolo, apparently?
• curprev 21:2021:20, 19 March 2019‎ Rainwarrior talk contribs‎ 11,156 bytes +128‎ →‎Internal patch set: updating patch set to Nuke.KYT's dump

12 January 2019

• curprev 18:2918:29, 12 January 2019‎ Tepples talk contribs‎ m 11,028 bytes +15‎ →‎References: add references element for cite extension

20 November 2018

• curprev 05:4505:45, 20 November 2018‎ Koitsu talk contribs‎ 11,013 bytes +34‎ No edit summary

3 September 2018

• curprev 17:5317:53, 3 September 2018‎ Rainwarrior talk contribs‎ 10,979 bytes +133‎ →‎Audio Enable ($E000): reference for LFO reset
• curprev 07:5307:53, 3 September 2018‎ Rainwarrior talk contribs‎ 10,846 bytes −5‎ →‎Audio Enable ($E000): note that this affects LFO

2 September 2018

• curprev 02:0102:01, 2 September 2018‎ Rainwarrior talk contribs‎ m 10,851 bytes +8‎ →‎References: thread was update
• curprev 01:5801:58, 2 September 2018‎ Rainwarrior talk contribs‎ 10,843 bytes 0‎ →‎Internal patch set: more small revisions, getting even closer (see thread)

1 September 2018

• curprev 23:3723:37, 1 September 2018‎ Rainwarrior talk contribs‎ 10,843 bytes 0‎ →‎Internal patch set: improvements from ap9 (was posted in patch set reference thread linked below)
• curprev 22:5422:54, 1 September 2018‎ Rainwarrior talk contribs‎ 10,843 bytes 0‎ →‎Register Write Delay: shorten address to clarify that these are ZP writes
• curprev 00:4500:45, 1 September 2018‎ Rainwarrior talk contribs‎ 10,843 bytes +105‎ →‎Audio Enable ($E000): clarifying as much as I know about what it does

30 August 2018

• curprev 21:5721:57, 30 August 2018‎ Rainwarrior talk contribs‎ 10,738 bytes +300‎ →‎Registers: the mirroring register has an audio enable bit, should be mentioned on this page

1 October 2015

• curprev 01:1101:11, 1 October 2015‎ Freem talk contribs‎ m 10,438 bytes −4‎ →‎References: fix link to "VRX7 audio test program"

18 July 2015

• curprev 16:0816:08, 18 July 2015‎ Tepples talk contribs‎ 10,442 bytes +530‎ →‎References: Useful links suggested by Grapeshot at http://forums.nesdev.com/viewtopic.php?p=151167#p151167

14 April 2015

• curprev 05:2505:25, 14 April 2015‎ Rainwarrior talk contribs‎ m 9,912 bytes +47‎ →‎References: link appearance
• curprev 05:2405:24, 14 April 2015‎ Rainwarrior talk contribs‎ m 9,865 bytes +1‎ →‎References: spelling
• curprev 05:2405:24, 14 April 2015‎ Rainwarrior talk contribs‎ 9,864 bytes +79‎ reference for modulator sustain behaviour
• curprev 05:2305:23, 14 April 2015‎ Rainwarrior talk contribs‎ 9,785 bytes +388‎ →‎Custom Patch: very strange note about modulator sustain

11 September 2014

• curprev 04:1104:11, 11 September 2014‎ Koitsu talk contribs‎ 9,397 bytes −18‎ Removal of syntax highlighter

8 April 2014

• curprev 22:0622:06, 8 April 2014‎ Lidnariq talk contribs‎ m 9,415 bytes +3‎ naruko pointed out that calling it the "n163" is technically incorrect

25 August 2013

• curprev 07:3207:32, 25 August 2013‎ Koitsu talk contribs‎ 9,412 bytes −4‎ No edit summary

24 August 2013

• curprev 09:1709:17, 24 August 2013‎ Koitsu talk contribs‎ 9,416 bytes +17‎ →‎Register Write Delay

18 October 2012

• curprev 18:2518:25, 18 October 2012‎ Zzo38 talk contribs‎ 9,399 bytes −4‎ No edit summary

20 August 2012

• curprev 06:4006:40, 20 August 2012‎ Rainwarrior talk contribs‎ 9,403 bytes +139‎ →‎References: new patch set forum reference
• curprev 06:3906:39, 20 August 2012‎ Rainwarrior talk contribs‎ 9,264 bytes 0‎ →‎Internal patch set: new patch set

3 August 2012

• curprev 20:0120:01, 3 August 2012‎ Zzo38 talk contribs‎ 9,264 bytes +137‎ No edit summary

19 July 2012

• curprev 04:1904:19, 19 July 2012‎ Rainwarrior talk contribs‎ 9,127 bytes +24‎ →‎Channels: oscillator is not quartz; less accurate ceramic

5 July 2012

• curprev 06:3506:35, 5 July 2012‎ Rainwarrior talk contribs‎ m 9,103 bytes −66‎ →‎Differences from OPLL: likely none of them are exactly the same

26 May 2012

• curprev 19:4519:45, 26 May 2012‎ Rainwarrior talk contribs‎ m 9,169 bytes +3‎ expansion audio category

16 May 2012

• curprev 21:2421:24, 16 May 2012‎ Rainwarrior talk contribs‎ m 9,166 bytes +16‎ →‎Channels
• curprev 21:1621:16, 16 May 2012‎ Rainwarrior talk contribs‎ 9,150 bytes +81‎ →‎Channels: note about trigger bit (writing 1 does not always retrigger), noting output is serial, revising relationship to NES CPU rate (it is double, to within the accuracy of a quartz oscillator; 1/10 Hz is too fine for the given accuracy)
• curprev 18:3418:34, 16 May 2012‎ Rainwarrior talk contribs‎ m 9,069 bytes +23‎ →‎Register Write Delay
• curprev 17:3917:39, 16 May 2012‎ Rainwarrior talk contribs‎ 9,046 bytes +339‎ →‎Registers: example delay code from Lagrange Point
• curprev 14:1314:13, 16 May 2012‎ Tepples talk contribs‎ 8,707 bytes +72‎ →‎Channels: Twice M2
• curprev 07:0307:03, 16 May 2012‎ Rainwarrior talk contribs‎ 8,635 bytes +214‎ →‎Channels: more accurate update frequency
• curprev 05:4005:40, 16 May 2012‎ Rainwarrior talk contribs‎ 8,421 bytes −1‎ →‎Internal patch set: much better patch set
• curprev 03:5103:51, 16 May 2012‎ Rainwarrior talk contribs‎ m 8,422 bytes +6‎ →‎Audio Register Select ($9010)
• curprev 03:3303:33, 16 May 2012‎ Rainwarrior talk contribs‎ 8,416 bytes −36‎ →‎Registers: found the address/write timings in the OPLL datasheet, will test them more thoroughly later
• curprev 02:3402:34, 16 May 2012‎ Tepples talk contribs‎ 8,452 bytes +49‎ →‎Custom Patch: half-wave rectified explained
• curprev 02:1302:13, 16 May 2012‎ Rainwarrior talk contribs‎ 8,403 bytes +17‎ →‎Custom Patch: waveform is sine or half-wave rectified sine, not abs(sin)
• curprev 02:0002:00, 16 May 2012‎ Rainwarrior talk contribs‎ 8,386 bytes +481‎ →‎Registers: delay is required between writes

13 April 2012

• curprev 21:1521:15, 13 April 2012‎ Rainwarrior talk contribs‎ m 7,905 bytes +16‎ →‎Registers: hierarchy
• curprev 21:1421:14, 13 April 2012‎ Rainwarrior talk contribs‎ m 7,889 bytes +73‎ →‎Custom Patch: formatting
• curprev 20:5820:58, 13 April 2012‎ Rainwarrior talk contribs‎ m 7,816 bytes +22‎ →‎Channels: formatting
• curprev 20:5520:55, 13 April 2012‎ Rainwarrior talk contribs‎ 7,794 bytes +130‎ →‎Channels: sustain bit
• curprev 20:5220:52, 13 April 2012‎ Rainwarrior talk contribs‎ 7,664 bytes +2,257‎ →‎Custom Patch: explaining parameters
• curprev 20:0120:01, 13 April 2012‎ Rainwarrior talk contribs‎ m 5,407 bytes +85‎ more clarification of volume
• curprev 19:4719:47, 13 April 2012‎ Rainwarrior talk contribs‎ m 5,322 bytes +437‎ clarifying relationship to OPLL
• curprev 19:4019:40, 13 April 2012‎ Rainwarrior talk contribs‎ 4,885 bytes +131‎ →‎References: adding YM2413 datasheets
• curprev 19:3819:38, 13 April 2012‎ Rainwarrior talk contribs‎ m 4,754 bytes +60‎ →‎Registers: write-only
• curprev 19:3719:37, 13 April 2012‎ Rainwarrior talk contribs‎ m 4,694 bytes −4‎ →‎Custom patch: unused bit is documented unused on YM2413 datasheet
• curprev 19:3119:31, 13 April 2012‎ Rainwarrior talk contribs‎ m 4,698 bytes +14‎ →‎References: fixing link
• curprev 19:3019:30, 13 April 2012‎ Rainwarrior talk contribs‎ 4,684 bytes +1,004‎ explaining channel registers
• curprev 18:4918:49, 13 April 2012‎ Rainwarrior talk contribs‎ 3,680 bytes +2,697‎ filling out VRC7 info

12 June 2009

• curprev 12:4612:46, 12 June 2009‎ Banshaku talk contribs‎ m 983 bytes +983‎ Created page with '===VRC7 Audio=== The Konami VRC7, in addition to being a mapper chip, also produces 6 channels of 2-operator FM Synthesis Audio. The synthesis core appears to be mostly ...'