Editing MOS Technology 6581 (section)

== Remarking and forgery ==

Since 6581 and 8580 SID ICs are no longer produced, they have become highly sought after. In late 2007, various defective chips started appearing on eBay as supposedly "new".<ref>{{cite web |url=http://kevtris.org/Projects/sid/remarked_sids.html |title=Remarked SID Chips Sold as New |last=Horton |first=Kevin |work=SID |url-status=live |archive-url=https://web.archive.org/web/20190704133202/http://kevtris.org/Projects/sid/remarked_sids.html |archive-date=2019-07-04 }}</ref>{{unreliable source?|date=January 2012}} Some of these remarked SIDs have a defective filter, but some also have defective channels/noise generators, and some are completely dead.

Fake SID chips have also been supplied to unwitting buyers from unscrupulous manufacturers in China; the supplied chips are laser-etched with completely bogus markings, and the chip inside the package is not a SID at all.{{citation needed|date=September 2018}}