Probably the Liquivsion X1, circa 2007. It originally ran VPM from a third party vendor and Buhlmann 16 GF was later offered as an option. The display was monochrome but pretty bright, and you altered the settings by tapping the case instead of pushing buttons. The problem was that you needed a Windows PC to install the software, leaving us Mac users to struggle with installing Windows XP on a virtual machine just to get our dive computer set up! The X1 was the first one I remember with no lock-outs and non-proprietary deco models, so it sort of set the stage for Shearwater.