On 04/05/2012, at 8:06 AM, Rob Jarratt wrote: Rob I believe that you can use the printer port as a console, just need to short two pins together.. There is some info here http://www.chdickman.com/pdp11/pro380.txt Cheers, Chris

It won't mind that there;s no monitor, it will give an error if it can't find the keybaord, but it'll get a lot further than 'all lights on'. In fact I am not even sure that a keyboard error does show up on the diagnostic lights. The power-on reset signal turns all the lights on. One of the first things the CPU does is to turn at least one of htem off. So if they're all on then most likely rither the CPU isn't running at all (or at least isn't runnign the bootstrap at all), or the thing is being held in the reset state. I suspect that the reset signal is generateed from some kind of power-OK signal so that if there's a power rail out-of-spec it'll stick in the reset state. What I can't rememebr if is fhtat signal originates in the PSU or not. There is a Technical manual for either the Pro350 or 380 on Bitsavers and a printset for the other one. The 2 machines are quite different but I think the PSU connector is the same, so you can start there.... A colour 350 has 2 boards for video in the cardcage with a little ribbon cable linking them across the top. If you have such a cable, thrn the colour board is fitted. I am not sure the exact details of all the cables, but the Pro and Rainbow video conenctors do haev diffenreces in terms of which signal is used. The conenctor is a DA15, there are 4 pins fot hte keyboard, a 12V power lien for the mono monitor and 4 video signals, R,G,B and mono. I would look at both mono and green to see if there's anythign resembling a video signal on either. Or just try a composite (RS170 rate) monitor on mono and green in turn. You won't damage anything. Do you have my notes on the universal video cable for the DEC desktops? -tony