Talk:MOS Technology 6581

message: This article should be moved to MOS Technology 6581 for greater orthogonality with other MOS Technology integrated circuit articles, such as MOS Technology 6522 and MOS Technology 6532. Note that these are named by their numeric designations and not their titles (VIA and RIOT, respectively). This should be made consistent. Crotalus horridus 19:32, 11 December 2005 (UTC)
replies: text: OK with me, but IF AND ONLY IF you change ALL the links on ALL pages that in turn link here. Thats a lot of work see. Nixdorf 19:47, 11 December 2005 (UTC)

text: I prefer it the way it is now. Mirror Vax 23:15, 11 December 2005 (UTC)
thread_title: Proposed article move

message: Does anybody really know at which actual hardware revision the pop-on-volume-change "bug" was fixed? I'm not sure, but I think the story is that while C64 C model has  8580s, it's not at all related to the sample volume issues, because every C64 C I've used seem to play samples just fine and this issue cropped up after the C generation. I have both a C64C and a C64G, and the C can play digital samples just fine, while the G has pretty quiet samples - so it was "fixed" in either the G (which seems to be my recollection) or some slightly earlier C64 hardware iteration. --wwwwolf (barks/growls) 15:45, 14 January 2006 (UTC)
thread_title:  Fixed in...? 

message: "This probably means that the R1 was the first round of chips and R2 actually the second mask produced."
What exactly does the author mean 'and R2 actually the second mask produced."? I was going to reword it, but I don't understand what he/she was trying to communicate with this sentence. JousterL 00:54, 08 November 2006 (UTC)
thread_title:  Phrasing In Revisions Section 

message: The following statement:
"A HMOS-II version of the 6581 was produced, the 6582. Like the 8580, this chip used 5 volts and 9 volts for its power supplies. It was never shipped in new Commodore 64s, however due to its lower voltage requirement,"
Appears to be an invalid rationale for the 6582 not being shipped in new Commodore 64s, since 8580's were shipped in C models, and these are 9V HMOS-II devices. I think this statement should be removed because it's speculative.— Preceding unsigned comment added by 24.123.112.118 (talk) 18:08, 12 March 2007 (UTC)
thread_title:  Invalid Rationale? 

message: It seems to me (tho it is equivalent)  that the SID did ring modulation by multiplying the values of the oscilators instead of convolving their spectra as this is far far cheaper to implement.  In simple terms, in a ring modulator the output of one oscilator acts as a volume control for another oscilator. There is really no need to work in the frequency domain and it seems highly unlikely that the SID (or anything in those times bar supercomputers) was capable of spectral analysis.— Preceding unsigned comment added by 83.87.224.111 (talk) 12:37, 21 December 2007 (UTC)
replies: text: That is incorrect. Ring modulation on the SID is actually done by setting the output of one oscillator to the logical XOR of the output of said oscillator and the MSB (most significant bit) of another oscillator's internal accumulator value. In addition, ring modulation on the SID can only be enabled with the triangle wave, so the output of ring modulation will always be a triangle wave ring modulated with a square wave (no matter the pulse width value, as the wave is coming from an accumulator, not a waveform generator's output). TreeNamedUser (talk) 04:04, 17 February 2021 (UTC)
thread_title:  Ring Modulation 

message: Under the "Conventional Music" section, we could include a note about the The Postal Service. Something like: "Although The Postal Service does not use any samples of SID music, many of their tracks have a sound similar to SID sound." 
MatrixFrog (talk) 05:47, 11 January 2010 (UTC)
thread_title: Mention The Postal Service

message: Hi.  That section was tagged for over 4 years as lacking references.  So I removed all entries that weren't immediately verifiable via either a still-alive link or its own article and references therein.  The unreferenced section tag has been removed.  Anyone who misses the old content can please add it back with some kind of verifiability or reliable source to collaborate. --Ds13 (talk) 02:16, 29 December 2011 (UTC)
thread_title:  Cleaned up "Conventional music" section 

message: :"...the SID was originally designed to have 32 independent voices, sharing a common oscillator."
This doesn't make sense to me, and seems like a misreading or misquote to me. What does the source actually say? Were they supposed to share a common noise generator, or maybe an LFO modulator? Or possibly high frequency multiplexing sharing a common operator amongst all voices? I don't understand how independent voices can share the same oscillator. - Rainwarrior (talk) 03:54, 10 December 2012 (UTC)
replies: text: The question of what exactly the original source says is definitely a valid question, but I don't believe this is an absurd a claim as it might seem on face value.  I believe that using frequency dividers, one high-speed oscillator (probably running at higher than audio frequency so that all the needed musical note frequencies can be divided evenly) can drive multiple voices that can each play different notes (and potentially even different waveforms).  --Dan Harkless (talk) 18:07, 17 October 2016 (UTC)

text: this whole story isn't implausible - the DOC chip used in Yannes' later work (Mirage, ESQ-1) is effectively this. Agrecascino (talk) 02:54, 12 March 2022 (UTC)
thread_title:  32 voices one oscillator? 

message: I have removed the following list of links, which is swamping the article, is more like advertising, and seems to not comply with Wikipedia:External links. — billinghurst sDrewth 08:07, 21 August 2013 (UTC)
thread_title:  Removed link overkill 

message: Hello fellow Wikipedians,
I have just modified 3 external links on MOS Technology SID. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
*Corrected formatting/usage for http://www.prophet64.com/
*Added archive https://web.archive.org/web/20071002102626/http://www.prophet64.com/ to http://www.prophet64.com/
*Added  tag to http://www.asciilifeform.com/parallelsid/parasid.html
*Added archive https://web.archive.org/web/20100811142353/http://forskningsavd.se/wiki/index.php/SIDblaster to http://forskningsavd.se/wiki/index.php/SIDblaster
When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
Cheers.—InternetArchiveBot (Report bug) 23:52, 28 May 2017 (UTC)
thread_title:  External links modified 

message: Hello fellow Wikipedians,
I have just modified one external link on MOS Technology SID. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
*Added archive https://web.archive.org/web/20081110115734/http://bel.fi/~alankila/c64-sw/ to http://www.bel.fi/~alankila/c64-sw/
When you have finished reviewing my changes, you may follow the instructions on the template below to fix any issues with the URLs.
Cheers.—InternetArchiveBot (Report bug) 18:58, 10 January 2018 (UTC)
thread_title:  External links modified 

message: http://sid.kubarth.com/sid_dies.html
On this weblink, there are microphotos of markings on the MOS 6581R3 die, including one odd marking that says "B.Y. TIM". Searching this phrase on Google returns me nothing relevant to the 6581, so the meaning of this marking (whether it was the initials of someone or something else) is a mystery to me. Not even the C64 Wiki has any info about this marking, but it does have an article on a piece of software dubbed TIM (for "Terminal Interface Monitor") used on CBM and CBM-II computers. However, I cannot see a connection between this TIM and the "TIM" in the 6581R3 markings. Any info on this mysterious "B.Y. TIM" marking that could be mentioned on this article? ​‑‑🌀⁠SilSinnAL982100⁠💬 02:20, 28 March 2019 (UTC)
replies: text: I know that "B.Y." means Bob Yannes, the person who designed the SID chip. I do not, however, know what "TIM" means. TreeNamedUser (talk) 04:06, 17 February 2021 (UTC)
thread_title:  "B.Y. TIM"