# Mackie Onyx Blackjack The Onyx Blackjack is a compact 2×2 USB recording interface. The notebook copies board-level fabrication numbers, revision identifiers, a 2010 date, and [[UL 94]] markings, showing component-level rather than merely retail-level inventory. ## Source [[Scanned_20260730-1230#PDF Page 32|Scanned_20260730-1230, PDF page 32]] The relation of the small `6V / C85474` label to this interface remains unresolved.