With this, and the dual-SID add-on boards for real Commodore 64s there are not enough original SID chips to go around. Already hawkers on eBay rip them out of working C64s and sell them separately at jacked-up prices, to people who have managed to buy C64 motherboards at a lower price because they are missing their SID chips, probably in fact the very same SID chip they are now paying over the odds for separately.<p>There are a few pseudo-SID hardware projects[1,2,3] that can produce 'good enough' SID-like sounds, maybe the more honourable thing is to rework this project into something that uses those ?<p>---<p>[1] <a href="https://www.c64-wiki.com/wiki/SwinSID" rel="nofollow">https://www.c64-wiki.com/wiki/SwinSID</a><p>[2] <a href="https://github.com/Sgw32/UltiSID/tree/hal_usid" rel="nofollow">https://github.com/Sgw32/UltiSID/tree/hal_usid</a><p>[3] <a href="https://www.retrocomp.cz/produkt?id=2" rel="nofollow">https://www.retrocomp.cz/produkt?id=2</a>