Vs. System: Revision history

28 August 2022

• curprev 10:2810:28, 28 August 2022‎ NewRisingSun talk contribs‎ 11,088 bytes +244‎ Updated information regarding left vs. right stick usage and $4016 vs. $4017 wiring

11 December 2020

• curprev 00:1200:12, 11 December 2020‎ Rainwarrior talk contribs‎ 10,844 bytes +107‎ →‎Controller and CHR ROM bank ($4016 write): replacing "trigger" with "assert" or "request"

9 December 2020

• curprev 20:1220:12, 9 December 2020‎ Lidnariq talk contribs‎ m 10,737 bytes −7‎ →‎Controller and CHR ROM bank ($4016 write): refer to bit values instead of voltages (h/t nocash)
• curprev 01:4501:45, 9 December 2020‎ Lidnariq talk contribs‎ 10,744 bytes +64‎ →‎Controller and CHR ROM bank ($4016 write): h/t Fiskbit
• curprev 01:1801:18, 9 December 2020‎ Lidnariq talk contribs‎ m 10,680 bytes +90‎ →‎Controller and CHR ROM bank ($4016 write): maybe clearer?

29 November 2020

• curprev 14:5314:53, 29 November 2020‎ Tepples talk contribs‎ 10,590 bytes +369‎ →‎Synchronization: Official use of "main" and "sub" terminology
• curprev 04:5304:53, 29 November 2020‎ Lidnariq talk contribs‎ m 10,221 bytes +25‎ →‎Controller 1 data, DIP switches, and watchdog timer ($4017 read): avoid passive voice

3 February 2020

• curprev 12:5412:54, 3 February 2020‎ VOrun talk contribs‎ 10,196 bytes −2‎ No edit summary

25 June 2019

• curprev 04:3304:33, 25 June 2019‎ Lidnariq talk contribs‎ m 10,198 bytes +3‎ →‎Controller 2 data, coins, and DIP switches ($4016 read): The UniSystem wiring diagram *definitely* only connects one wire between the coin acceptors and the secondary CPU

24 June 2019

• curprev 13:5213:52, 24 June 2019‎ Tepples talk contribs‎ 10,195 bytes +93‎ →‎Palette: What $2000/$2001 swapping actually does: no NMI

28 January 2019

• curprev 21:4621:46, 28 January 2019‎ Tepples talk contribs‎ 10,102 bytes +164‎ Example of what this shared RAM is used for when battery backed: counting coins inserted into "main" and "sub" systems
• curprev 21:1521:15, 28 January 2019‎ Lidnariq talk contribs‎ 9,938 bytes +83‎ mention shared RAM can be battery-backed.

12 January 2019

• curprev 19:0319:03, 12 January 2019‎ Lidnariq talk contribs‎ 9,855 bytes +38‎ →‎Supported mappers: should probably explicitly call out "mapper 0" vs. system games as bad headers
• curprev 18:3018:30, 12 January 2019‎ Tepples talk contribs‎ m 9,817 bytes +43‎ →‎See also: add references element for cite.php

1 January 2019

• curprev 02:5602:56, 1 January 2019‎ Lidnariq talk contribs‎ 9,774 bytes +15‎ change grammatical number to reflect that it's really two NESes on a single board
• curprev 02:1702:17, 1 January 2019‎ Lidnariq talk contribs‎ m 9,759 bytes 0‎ typo
• curprev 02:1002:10, 1 January 2019‎ Lidnariq talk contribs‎ 9,759 bytes +1,176‎ Make the introduction actually useful. Mention that it's not consistent whether a given physical control maps to $4016 or $4017.
• curprev 01:4101:41, 1 January 2019‎ Lidnariq talk contribs‎ 8,583 bytes +3‎ I should be consistent with my terminology. I already started using primary/secondary, so use that throughout.
• curprev 01:4001:40, 1 January 2019‎ Lidnariq talk contribs‎ 8,580 bytes +507‎ explain synchronization

2 July 2018

• curprev 22:1222:12, 2 July 2018‎ Lidnariq talk contribs‎ 8,073 bytes −5‎ →‎Controller 2 data, coins, and DIP switches ($4016 read): Sour offered this hopefully-clearer description of the msbit

27 August 2017

• curprev 21:3321:33, 27 August 2017‎ Lidnariq talk contribs‎ m 8,078 bytes −77‎ →‎Coin counter ($4020-$403F, &c): Now that we have an article open bus behavior, link there rather than reexplaining it here.

17 May 2017

• curprev 19:1919:19, 17 May 2017‎ Lidnariq talk contribs‎ 8,155 bytes +235‎ →‎Controller and CHR ROM bank ($4016 write): try to rewrite [$4016]&2 behavioral description for clarity.

22 February 2017

• curprev 05:0405:04, 22 February 2017‎ Lidnariq talk contribs‎ 7,920 bytes +259‎ →‎See also: include next characterization test rom

9 September 2016

• curprev 01:3101:31, 9 September 2016‎ Lidnariq talk contribs‎ 7,661 bytes −18‎ →‎Controller 2 data, coins, and DIP switches ($4016 read): More data points on coin drop duration

6 September 2016

• curprev 21:3121:31, 6 September 2016‎ Lidnariq talk contribs‎ m 7,679 bytes +124‎ the 2s bit for the joystick inputs is well-defined too
• curprev 20:4520:45, 6 September 2016‎ Lidnariq talk contribs‎ 7,555 bytes +181‎ →‎Controller 2 data, coins, and DIP switches ($4016 read): somehow I missed this until I rereread everynes

16 June 2016

• curprev 04:5504:55, 16 June 2016‎ Lidnariq talk contribs‎ m 7,374 bytes 0‎ yeah, sure, camelcase sounds good. Nintendo certainly used it in the copy of the time

14 June 2016

• curprev 21:3121:31, 14 June 2016‎ Lidnariq talk contribs‎ m 7,374 bytes +409‎ add brief aside about copy prevention on the Vs. System

7 June 2016

• curprev 03:3403:34, 7 June 2016‎ Lidnariq talk contribs‎ m 6,965 bytes +4‎ →‎Controller 1 data, DIP switches, and watchdog timer ($4017 read): fix up 0-indexing vs 1-indexing

5 June 2016

• curprev 03:0003:00, 5 June 2016‎ Lidnariq talk contribs‎ m 6,961 bytes −4‎ omit link to redirect

3 June 2016

• curprev 22:5722:57, 3 June 2016‎ Lidnariq talk contribs‎ m 6,965 bytes −4‎ →‎See also: omit link to redirect

21 February 2015

• curprev 04:1504:15, 21 February 2015‎ Lidnariq talk contribs‎ 6,969 bytes +24‎ →‎Controller 1 data, DIP switches, and watchdog timer ($4017 read): On the off chance that anyone thought that the slave CPU could be omitted, make it more clear.

20 February 2015

• curprev 21:3521:35, 20 February 2015‎ Lidnariq talk contribs‎ 6,945 bytes 0‎ →‎Coin counter ($4020-$403F, &c): ... the 6502 reads the LSB first, so open bus would contain the upper byte. OOPS.

10 November 2014

• curprev 07:3607:36, 10 November 2014‎ Lidnariq talk contribs‎ m 6,945 bytes +22‎ →‎Palette: it'd be nice to have a link to describe the palettes' contents

26 October 2014

• curprev 05:0905:09, 26 October 2014‎ Lidnariq talk contribs‎ 6,923 bytes +85‎ →‎Palette: 2c04 are actually the same colors, just different orders

25 October 2014

• curprev 00:0200:02, 25 October 2014‎ Tepples talk contribs‎ 6,838 bytes +105‎ →‎Palette: 2C05 to 2C03 socket adapter; fading woes

24 October 2014

• curprev 23:5223:52, 24 October 2014‎ Lidnariq talk contribs‎ m 6,733 bytes −7‎ →‎Coin counter ($4020-$403F, &c): interrupts don't operate mid-instruction ... DMA does.

9 July 2014

• curprev 08:0608:06, 9 July 2014‎ Lidnariq talk contribs‎ 6,740 bytes +57‎ →‎Controller 1 data, DIP switches, and watchdog timer ($4017 read): Only the "slave" CPU has the watchdog, but it affects both CPUs

4 May 2014

• curprev 18:4418:44, 4 May 2014‎ Lidnariq talk contribs‎ m 6,683 bytes −4‎ →‎See also: omit now-redundant link to redirect

23 April 2014

• curprev 02:5802:58, 23 April 2014‎ Lidnariq talk contribs‎ m 6,687 bytes +14‎ →‎Controller and CHR ROM bank ($4016 write): should link to Zapper article from here

22 April 2014

• curprev 00:2000:20, 22 April 2014‎ Lidnariq talk contribs‎ 6,673 bytes +425‎ finally get around to updating the questions from the test I wrote

8 March 2014

• curprev 00:2400:24, 8 March 2014‎ Lidnariq talk contribs‎ 6,248 bytes +532‎ →‎Controller 2 data, coins, and DIP switches ($4016 read): Say a little more... I should still finish that test ROM

17 September 2013

• curprev 00:1400:14, 17 September 2013‎ Lidnariq talk contribs‎ m 5,716 bytes +147‎ →‎Controller 2 data, coins, and DIP switches ($4016 read): reorder and minor rewrite

16 September 2013

• curprev 15:2915:29, 16 September 2013‎ Zepper talk contribs‎ m 5,569 bytes +13‎ →‎Controller 2 data, coins, and DIP switches ($4016 read): OK.
• curprev 02:2702:27, 16 September 2013‎ Lidnariq talk contribs‎ 5,556 bytes +179‎ →‎Controller 2 data, coins, and DIP switches ($4016 read): explain observed behavior
• curprev 02:1602:16, 16 September 2013‎ Zepper talk contribs‎ 5,377 bytes +10‎ →‎Controller 2 data, coins, and DIP switches ($4016 read): fixed info, my bad!
• curprev 00:5700:57, 16 September 2013‎ Zepper talk contribs‎ m 5,367 bytes +97‎ →‎Controller 2 data, coins, and DIP switches ($4016 read)

24 July 2013

• curprev 18:4618:46, 24 July 2013‎ Lidnariq talk contribs‎ 5,270 bytes +40‎ →‎Coin counter ($4020-$403F, &c): link to category

23 July 2013

• curprev 20:4920:49, 23 July 2013‎ Lidnariq talk contribs‎ 5,230 bytes +423‎ →‎See also: add links to mappers used

22 July 2013

• curprev 18:1918:19, 22 July 2013‎ Lidnariq talk contribs‎ 4,807 bytes +250‎ →‎Controller 2 data, coins, and DIP switches ($4016 read)