Still deciding. Thank you all for your input. This might be the greatest assembly of CNC talent on the internet: ger21, dezsoe, robertspark and me of course
I'm driving Clearpath Servo's which just take step and direction signals but unfortunately need more than 5v for a differential drive connection. Incidentally, they are working this way right now but Teknic says they are not as reliable when driven this way and can fail prematurely. If I use the MB2 with just ports 1 and 3 I lose the charge pump because its on port 2. Re-looking at the HDBB2 it has the analog out and the charge pump. The only drawback is the RJ45 servo connectors. I could make it work. But if they have a greater than 5v differential signal then I'd definitely use it. Would need 2, or one HDBB2 and one UCSB, either way ~$100 plus shipping.
Next option is the the AXBB_E; meets all the requirements just $50 more than the HDBB2.
Last option is possibly(?) the UD1 daughter board from cncroom. I like its architecture, I'm familiar with the UB1. I think the 2 LPT ports of the UC400eth are compatible with it(?). Its outputs are fast enough to function as line drivers for the servo's, I believe its freely configurable so its would just be a matter of correct pin assignments in the UCCNC software ?? No analog output though. ~$105 plus shipping.
Any thoughts?