Visual circuit tutorial: Revision history

6 March 2024

• curprev 16:0316:03, 6 March 2024‎ Quietust talk contribs‎ m 39,321 bytes +23‎ →‎Terms
• curprev 15:5015:50, 6 March 2024‎ Quietust talk contribs‎ m 39,298 bytes −372‎ →‎DRAM refresh: don't need to mention this

4 May 2023

• curprev 23:2523:25, 4 May 2023‎ Quietust talk contribs‎ m 39,670 bytes 0‎ remove pointless line breaks

3 May 2023

• curprev 05:2605:26, 3 May 2023‎ Lidnariq talk contribs‎ m 39,670 bytes +33‎ →‎Inverters: requested clarification
• curprev 05:1405:14, 3 May 2023‎ Lidnariq talk contribs‎ 39,637 bytes +68‎ →‎Inverters: try to clarify a little

17 April 2023

• curprev 04:0404:04, 17 April 2023‎ Lidnariq talk contribs‎ m 39,569 bytes −26‎ visual6502wiki is gone, point link at our mirror instead

6 September 2022

• curprev 23:5223:52, 6 September 2022‎ Lidnariq talk contribs‎ m 39,595 bytes 0‎ →‎Transistor dimensions: typo

9 November 2020

• curprev 15:5115:51, 9 November 2020‎ Quietust talk contribs‎ m 39,595 bytes −10‎ No edit summary

8 January 2020

• curprev 03:2003:20, 8 January 2020‎ Lidnariq talk contribs‎ 39,605 bytes −22‎ →‎Terms: replace dead link to some picture (what image??) with something from the wikimedia commons

20 November 2018

• curprev 05:5305:53, 20 November 2018‎ Koitsu talk contribs‎ 39,627 bytes +23‎ No edit summary

16 June 2015

• curprev 07:1607:16, 16 June 2015‎ Lidnariq talk contribs‎ m 39,604 bytes +2‎ →‎Control signals: use "approximate" symbol instead of tilde
• curprev 07:1307:13, 16 June 2015‎ Lidnariq talk contribs‎ m 39,602 bytes −6‎ →‎Shifting: change text to match revised image

14 June 2015

• curprev 23:3323:33, 14 June 2015‎ Quietust talk contribs‎ m 39,608 bytes −4‎ →‎Clocked latches: db7 is the 8th bit (since db0 is the first bit)
• curprev 12:1812:18, 14 June 2015‎ Ulfalizer talk contribs‎ 39,612 bytes +257‎ Undo revision 11163 by Ulfalizer (talk)

9 June 2015

• curprev 11:2911:29, 9 June 2015‎ Ulfalizer talk contribs‎ m 39,355 bytes −257‎ Nit.

18 May 2015

• curprev 03:5303:53, 18 May 2015‎ Ulfalizer talk contribs‎ m 39,612 bytes −3‎ hints at -> shows
• curprev 03:3603:36, 18 May 2015‎ Ulfalizer talk contribs‎ 39,615 bytes +65‎ There's transistors on the power sources too though
• curprev 03:3303:33, 18 May 2015‎ Ulfalizer talk contribs‎ 39,550 bytes +299‎ Clarify that the metal + poly overlap in the NOR example does not form transistors

17 May 2015

• curprev 01:5701:57, 17 May 2015‎ Lidnariq talk contribs‎ 39,251 bytes +2‎ →‎Parallel load: use actual table instead of preformatted thing (also use unicode arrow instead of ascii art)

16 May 2015

• curprev 22:0722:07, 16 May 2015‎ Ulfalizer talk contribs‎ 39,249 bytes −1‎ Grammar nit
• curprev 21:4821:48, 16 May 2015‎ Ulfalizer talk contribs‎ 39,250 bytes +11‎ Hint that a refresh might be similar to a real access
• curprev 20:4920:49, 16 May 2015‎ Ulfalizer talk contribs‎ 39,239 bytes +10‎ Have "latch" in the title of the latch section
• curprev 19:3019:30, 16 May 2015‎ Ulfalizer talk contribs‎ m 39,229 bytes +2‎ Nits
• curprev 19:0019:00, 16 May 2015‎ Ulfalizer talk contribs‎ 39,227 bytes −2‎ ...some more
• curprev 18:5818:58, 16 May 2015‎ Ulfalizer talk contribs‎ 39,229 bytes −2‎ De-parenthesize
• curprev 18:5518:55, 16 May 2015‎ Ulfalizer talk contribs‎ 39,231 bytes −21‎ "Which we would label" is redundant. '/' was already explained.
• curprev 18:4718:47, 16 May 2015‎ Ulfalizer talk contribs‎ 39,252 bytes +9‎ Small clocked latches clarification
• curprev 18:4118:41, 16 May 2015‎ Ulfalizer talk contribs‎ 39,243 bytes −112‎ The explanation for the NORiness of the latch is redundant given the image
• curprev 18:3018:30, 16 May 2015‎ Ulfalizer talk contribs‎ 39,355 bytes +1‎ Replace -- with en-dash
• curprev 18:2918:29, 16 May 2015‎ Ulfalizer talk contribs‎ m 39,354 bytes −5‎ De-will one more place
• curprev 18:2418:24, 16 May 2015‎ Ulfalizer talk contribs‎ 39,359 bytes 0‎ Nit
• curprev 18:2218:22, 16 May 2015‎ Ulfalizer talk contribs‎ 39,359 bytes +34‎ Was probably a good thing to explain why there might be a short
• curprev 18:1618:16, 16 May 2015‎ Ulfalizer talk contribs‎ 39,325 bytes −103‎ Simplify some more
• curprev 18:0218:02, 16 May 2015‎ Ulfalizer talk contribs‎ m 39,428 bytes −30‎ Language simplification nits
• curprev 17:5017:50, 16 May 2015‎ Ulfalizer talk contribs‎ 39,458 bytes −156‎ Remove potentially confusing note on S/R vs copied-into latches
• curprev 17:4617:46, 16 May 2015‎ Lidnariq talk contribs‎ m 39,614 bytes +3‎ use en-dashes instead of two hyphens
• curprev 17:4517:45, 16 May 2015‎ Ulfalizer talk contribs‎ 39,611 bytes −1‎ Separate out power source + transistor example into its own section
• curprev 17:4117:41, 16 May 2015‎ Ulfalizer talk contribs‎ 39,612 bytes +11‎ Slight clean-up in power source + transistor examples
• curprev 17:3317:33, 16 May 2015‎ Ulfalizer talk contribs‎ m 39,601 bytes +3‎ s/unimportant/less important/
• curprev 17:0717:07, 16 May 2015‎ Ulfalizer talk contribs‎ m 39,598 bytes −16‎ Nits
• curprev 16:5916:59, 16 May 2015‎ Ulfalizer talk contribs‎ m 39,614 bytes +2‎ Use consistent hyphen style
• curprev 16:5616:56, 16 May 2015‎ Ulfalizer talk contribs‎ 39,612 bytes +4‎ Emphasize a 'not'
• curprev 16:5516:55, 16 May 2015‎ Ulfalizer talk contribs‎ 39,608 bytes +10‎ Clean up 'Wire capacitance as storage' section
• curprev 16:4116:41, 16 May 2015‎ Ulfalizer talk contribs‎ 39,598 bytes +33‎ Point out the power source in the NOR section
• curprev 16:3816:38, 16 May 2015‎ Ulfalizer talk contribs‎ 39,565 bytes +13‎ Simplify inverter example + nits

25 March 2015

• curprev 02:5702:57, 25 March 2015‎ Rainwarrior talk contribs‎ m 39,552 bytes −14‎ resolve redirect to PPU scrolling

16 September 2014

• curprev 11:4711:47, 16 September 2014‎ Ulfalizer talk contribs‎ 39,566 bytes −2‎ State early that we're dealing with NMOS

14 February 2014

• curprev 15:2715:27, 14 February 2014‎ Ulfalizer talk contribs‎ m 39,568 bytes +9‎ No edit summary
• curprev 15:2615:26, 14 February 2014‎ Ulfalizer talk contribs‎ m 39,559 bytes +67‎ Slight reformulation
• curprev 15:2015:20, 14 February 2014‎ Ulfalizer talk contribs‎ m 39,492 bytes +4‎ No edit summary
• curprev 15:1715:17, 14 February 2014‎ Ulfalizer talk contribs‎ m 39,488 bytes −1‎ No edit summary
• curprev 15:1715:17, 14 February 2014‎ Ulfalizer talk contribs‎ 39,489 bytes +246‎ Introduce the / notation the first time it appears

18 January 2014

• curprev 05:1805:18, 18 January 2014‎ Ulfalizer talk contribs‎ m 39,243 bytes −96‎ Misc. minor cleanup
• curprev 05:1305:13, 18 January 2014‎ Ulfalizer talk contribs‎ m 39,339 bytes 0‎ No edit summary

2 January 2014

• curprev 17:4617:46, 2 January 2014‎ Quietust talk contribs‎ m 39,339 bytes +30‎ →‎Digital-to-analog conversion (DAC)
• curprev 17:4417:44, 2 January 2014‎ Quietust talk contribs‎ m 39,309 bytes +41‎ →‎Decoders and mask ROMs: this particular ROM is a NOR ROM - other variants include OR (for PMOS) and NAND (also NMOS)

4 December 2013

• curprev 17:3917:39, 4 December 2013‎ Ulfalizer talk contribs‎ m 39,268 bytes +5‎ No edit summary
• curprev 15:5315:53, 4 December 2013‎ Quietust talk contribs‎ m 39,263 bytes +1‎ →‎Inverters: this terminology is almost definitely specific to this article
• curprev 10:2110:21, 4 December 2013‎ Ulfalizer talk contribs‎ 39,262 bytes −26‎ Rephrase to avoid "electrically common" as it gets confusing with the section that follows
• curprev 09:1209:12, 4 December 2013‎ Ulfalizer talk contribs‎ m 39,288 bytes 0‎ No edit summary
• curprev 09:0709:07, 4 December 2013‎ Ulfalizer talk contribs‎ 39,288 bytes +1,546‎ Add examples to introductory sections and remove forum link

22 July 2013

• curprev 02:1802:18, 22 July 2013‎ Ulfalizer talk contribs‎ 37,742 bytes +121‎ Clarify that the left transistor in the inverter example is just a resistor
• curprev 02:0302:03, 22 July 2013‎ Ulfalizer talk contribs‎ 37,621 bytes +273‎ Add temporary link to hopefully un-confusing thread

15 July 2013

• curprev 17:4417:44, 15 July 2013‎ Ulfalizer talk contribs‎ 37,348 bytes +232‎ The DRAM rows become consecutive if we reverse the row selection bits

12 July 2013

• curprev 13:0413:04, 12 July 2013‎ Ulfalizer talk contribs‎ 37,116 bytes +125‎ Add link to transistor video on YouTube

2 July 2013

• curprev 08:5108:51, 2 July 2013‎ Ulfalizer talk contribs‎ 36,991 bytes +89‎ Link org's PPU analysis too

30 June 2013

• curprev 09:2809:28, 30 June 2013‎ Ulfalizer talk contribs‎ 36,902 bytes +8‎ Has contributions from more people now, so don't imply I wrote everything

29 June 2013

• curprev 03:4303:43, 29 June 2013‎ Ulfalizer talk contribs‎ 36,894 bytes −5‎ Use "zeroth" instead of "bottom-most" since it gets a bit confusing with the bit being at the top of the adder
• curprev 03:3103:31, 29 June 2013‎ Ulfalizer talk contribs‎ m 36,899 bytes +18‎ Style tweaks
• curprev 01:3501:35, 29 June 2013‎ Lidnariq talk contribs‎ m 36,881 bytes 0‎ →‎Terms: fix typo
• curprev 01:3001:30, 29 June 2013‎ Quietust talk contribs‎ m 36,881 bytes +34‎ →‎Terms
• curprev 01:3001:30, 29 June 2013‎ Quietust talk contribs‎ 36,847 bytes −18‎ →‎Terms
• curprev 01:2601:26, 29 June 2013‎ Quietust talk contribs‎ 36,865 bytes +1,539‎ →‎Terms: describe PMOS and CMOS, just for completeness
• curprev 00:3900:39, 29 June 2013‎ Quietust talk contribs‎ m 35,326 bytes +126‎ →‎Adders
• curprev 00:3300:33, 29 June 2013‎ Quietust talk contribs‎ 35,200 bytes +7‎ →‎DRAM refresh: it wasn't "possible" to readd them - it was *required* because otherwise it didn't work anymore

28 June 2013

• curprev 19:0819:08, 28 June 2013‎ Lidnariq talk contribs‎ m 35,193 bytes 0‎ →‎Transistor dimensions: fix numbers for fixed inverter diagram
• curprev 15:0815:08, 28 June 2013‎ Ulfalizer talk contribs‎ 35,193 bytes +124‎ Add link to PPU overview image.
• curprev 15:0315:03, 28 June 2013‎ Ulfalizer talk contribs‎ 35,069 bytes +251‎ Add link for extra node names repo.

27 June 2013

• curprev 20:3720:37, 27 June 2013‎ Lidnariq talk contribs‎ m 34,818 bytes +18‎ →‎Transistor dimensions: prettify wikipedia link
• curprev 20:3620:36, 27 June 2013‎ Lidnariq talk contribs‎ m 34,800 bytes +8‎ →‎Transistor dimensions: signals aren't transistors
• curprev 20:3420:34, 27 June 2013‎ Lidnariq talk contribs‎ 34,792 bytes +1,578‎ →‎Transistor dimensions: new section about transistor sizing

16 June 2013

• curprev 13:1013:10, 16 June 2013‎ Ulfalizer talk contribs‎ m 33,214 bytes +6‎ No edit summary

14 June 2013

• curprev 16:3916:39, 14 June 2013‎ Ulfalizer talk contribs‎ m 33,208 bytes +6‎ No edit summary
• curprev 16:3716:37, 14 June 2013‎ Ulfalizer talk contribs‎ 33,202 bytes +193‎ Add info on apu_clk2x signals
• curprev 16:1316:13, 14 June 2013‎ Ulfalizer talk contribs‎ 33,009 bytes +237‎ Superbuffers often appear on circuits with a large fan-out

13 June 2013

• curprev 05:5405:54, 13 June 2013‎ Ulfalizer talk contribs‎ m 32,772 bytes −2‎ Use "similar" instead of "identical". You don't get lines and their inverses running in the mask ROM for example.

12 June 2013

• curprev 00:1100:11, 12 June 2013‎ Ulfalizer talk contribs‎ m 32,774 bytes 0‎ No edit summary

11 June 2013

• curprev 05:4305:43, 11 June 2013‎ Ulfalizer talk contribs‎ 32,774 bytes −28‎ CPU pinout page doesn't mention RDY, so don't link it
• curprev 05:1105:11, 11 June 2013‎ Ulfalizer talk contribs‎ 32,802 bytes +1,282‎ Add section on 6502 cycle and phase timing
• curprev 04:2204:22, 11 June 2013‎ Ulfalizer talk contribs‎ 31,520 bytes +72‎ Precharge logic is now active in Visual 2C02
• curprev 02:1902:19, 11 June 2013‎ Ulfalizer talk contribs‎ 31,448 bytes +35‎ Be more specific than "left" and "right" now that there are three images for the cross-coupled inverter
• curprev 02:0102:01, 11 June 2013‎ Ulfalizer talk contribs‎ 31,413 bytes +99‎ Output drivers neither source nor sink for reads too
• curprev 01:5501:55, 11 June 2013‎ Ulfalizer talk contribs‎ 31,314 bytes −4‎ s/generates/sinks/ ("source" and "generate" are synonyms :P)
• curprev 01:5301:53, 11 June 2013‎ Ulfalizer talk contribs‎ 31,318 bytes +181‎ Output drivers can be tri-stated by activating neither the pull-up nor the pull-down transistors
• curprev 01:1501:15, 11 June 2013‎ Quietust talk contribs‎ 31,137 bytes +154‎ represent the actual CPU clock ratio

9 June 2013

• curprev 23:1723:17, 9 June 2013‎ Ulfalizer talk contribs‎ 30,983 bytes +524‎ Add note on master clock and CPU/PPU clock alignment

6 June 2013

• curprev 14:0414:04, 6 June 2013‎ Ulfalizer talk contribs‎ m 30,459 bytes −1‎ No edit summary
• curprev 11:4211:42, 6 June 2013‎ Ulfalizer talk contribs‎ 30,460 bytes +293‎ Add note on hashes and tildes on Visual 6502 node names (

4 June 2013

• curprev 20:4320:43, 4 June 2013‎ Lidnariq talk contribs‎ m 30,167 bytes 0‎ →‎Clocked latches: move /
• curprev 10:5510:55, 4 June 2013‎ Ulfalizer talk contribs‎ 30,167 bytes +285‎ Explain multiplexer