It&#x27;s been mentioned that their USB-serial converters are PICs that failed tests of other peripherals:<p><a href="http:&#x2F;&#x2F;hackaday.com&#x2F;2011&#x2F;01&#x2F;18&#x2F;mcp2200-usb-to-serial-chip-hacked-to-do-your-bidding&#x2F;" rel="nofollow">http:&#x2F;&#x2F;hackaday.com&#x2F;2011&#x2F;01&#x2F;18&#x2F;mcp2200-usb-to-serial-chip-ha...</a><p>One of the code samples they have on the site is a USB-serial converter, so it is likely to be running that firmware too.