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It wont work,(the simple explanation since you don't understand\haven't read the links) the RPi SOC doesn't do the memory\port mapping the parallel ports require.

When searching about this a thread I started came up, regarding SPI, mentioned parallel ports don't work with the RPi.

forum.linuxcnc.org/18-computer/51748-eoi...rpi5?start=10#303031

Rather than banging your head against a wall look at the Linuxcnc RIO project. Or get a Mesa 7i90HD, it's really quite cheap if you are based in the USA.
store.mesanet.com/index.php?route=produc...oduct&product_id=291

I think I have wrapped my head around my stepper motor and limit switch wiring. Regarding the spindle, I have a few questions:

The inverter is a woods eTrac x2c and the manual offers a nearly overwhelming number of options. I was never able to see the spindle working with the stock
AMC controller. I have attached the relevant table from the inverter manual and it seems like I should be able to use the analog spindle interface to provide 0-5vdc signal for speed control (vin). Do I simply use inputs on the 7i96 to conteol fwd/rev and a ground connected to the inverter common? Is that all there is to it?

The original wiring from the AMC controller to the inverter is somewhat different and it isn’t obvious that the AMC was actually able to control the spindle speed. It is connected to use 4 preset spindle speeds and the AMC has wires indicating an acceleration/deceleration signal, as well as some connections to NO and RCM.

 

 

Thanks. I tried all three variants on both parport cards. Did not work.
Let's not spend any more time on this. appreciate everyone's time and effort.
I'll likely jump back in this fall when I have more time.