On 4/18/05, Dave Dunfield <dave04a at dunfield.com> wrote: That sure looks like Qbus fingers on those boards... it would be odd to copy DEC's proportions and not their bus logic, but that's entirely possible. With a 68010 CPU, that screams "UNIX" to me (the differences between the 68000 and 68010 make virtual memory implementation practical. Besides that, the only reason to go with the more expensive processor is "loop mode" (a one-instruction cache that makes DBcc loops faster by eliminating the fetch cycle once the loop is started). The RGB output also supports the possibility it's a UNIX workstation. I don't know anything about the Jupiter, per se, but comparisons with DEC boards of the era might be illuminating. Checking what bus pins are used might be a useful exercise, to confirm if it's Qbus or not. -ethan