Raspberry Pi 4 with Mesa 7c81

andypugh wrote:

I am not sure what the "D" signifies though.

I would venture a guess at DPLL feature ...

Here is a bit file for a 7C81 and 1 or 2 7I85S's:

 

Haven't had much time recently to work on this stuff, but thank you so much for the bitfile!

I plan to retrofit old CNC lathe and keep original servo and spindle drives and motors. All drives are +- 10V analog input and motors have TTL encoders. My idea is to use 7c81 with 7I33TA. Is this configuration workable? Do I need some special bitfile for this combination?

Thank you for help

It would require a special bitfile and a special cable
a simpler (though more expensive) would be to add a 7I85/7I85S
and a 7I83, or a 7I77.

I wish we made a simple 25 pin analog/encoder interface

I decided to go with 7c81 + 7i77.

Then I will do what is suggested in this post:
" the easiest way to generate a working hal/ini configuration for the 7C81 is to use pncconf and setup say a 5I25+G540 configuration. Then change the card name in the .ini file and driver name in the hal file".

One more think. What cable/connector I need to buy to connect 7c81 to 7i77.

Thanks