Voltages like 204V and 208V mean it probably wants 3-phase. These are the phase-to-phase voltages on three phase systems where the phase to earth voltage is 117V and 120V respectively. It may only require two of the three phases, in which case you might be able to convert... The suggestion of using PC power supplies or similar is a good one but you may need something a bit more powerful. You need to know how much current it draws on each supply rail. I seem to recall that someone on this list has a working S/34. Could this person measure the current under various conditions? NB 5V rail current could be 100A or more, so don't just stick a multimeter in series with it! Use a proper shunt and millivoltmeter. A while back, I mentioned that I have some system/34 pocket references available to send to anyone with a s/34 who needs them. No-one has yet replied that I've seen. Any takers? The OS pocket reference is very thick (nearly 100 pages IIRC). Philip. PS Comparing the System/34 and the 8086 is not strictly fair - the 8086 appeared in laboratory tests in 1979 IIRC, while the S/34 was already on sale in 1977 I think. Things did shrink _very_ fast at that period! Also the S/34 has disks, - including my favourite floppy drive! - around 256K of memory, and other I/O that would have required several PC style boxes full of support chips, drives etc. for the 8086 in the late '70s.