Converting an old DMU 50, where to start?

so those 2 options effectively do the same thing, both ethernet solutions with 8 ports of serial expansion. option 1 is $30 cheaper. in around $500 total depending on how many extra io boards you end up needing.

you get 6 servo axes with encoder feedback. you need XYZ and Spindle, then you can add both your rotary table axes on if you can figure out how.

Thanks for the input, how does the 7i94 connect to the 7i77 since the 77 has db25 pin connector but 94 has ethernet and 26 pin idc

other way round. the 7i94 is the "master" with the ethernet port.

Mesa can provide the connecting cable for that or you can make up your own. The pin out is in the manuals. 

I use a ribbon cable and I mount the boards close together. The 26th pin on the idc is not used.

Hello, I would like to know if you managed to do this retrofit without changing the original drivers ? Could you update us ?