Onyx is the "driver". You cannot really print directly to a JV3 from Photoshop, etc. You use a RIP (Onyx, Flexisign, Rasterlink) etc to actually print. The actual Windows driver can be downloaded from Mimaki. You need the firewire driver but it's not a "print" driver. It's just so that a RIP can see it. Then the RIP will install it's own drivers (from Onyx, etc) for a particular brand/model machine.