just picked up this mill pretty sure its a 77-79 it has 2 axis nc control which doesn't work at the moment and my never again I think the issue there is the microprocessor and I have no clue on that old thing. I may switch the controls on it or convert to 100% manual its tight so id be ok with that. But first I would like to test the servos and drives so I know where I stand before deciding. The drives are the nc121f servo drives and there is no info on them I can find does anyone know for sure what the input signal is on these any help would be great and if anyone knows where to start on the controls that would be nice to. on that note when I power on some of the leds and 0's light up on pendant and manual says power down if certain code doesn't appear and repower after 30 sec and it will appear but that's not what mine does haha. mine comes up with different sets of leds and 0's lit up everytime no e code what so ever