Welcome to LinuxCNC.org

I don't recall seeing anything about selecting 0 or 1 but I can check here in a bit.

John

You would need to use the sserial selections if you are using the 48 I/O points.

7I76 field I/O will be on SSERIAL 0 (SSERIAL 1 is the 7I76's SSERIAL expansion port)
SSERIAL 2 and 3 will be on the second (internal) 5I25 connector

thanks Peter.
My intention is to have it automatically configure sserial 0 for the 48 i/o points, now that I know it's sserial 0
when I get back from Mexico time

I've got the new CNC machine on the workbench right now, booting NFS root from another machine. Kernel 2.6.35.9, RTAI from CVS, emc-dev. Letting latency-test run for the day, while I keep my 2 year old entertained.

I'll be working on getting the 5i25 and 7i76 set up this evening and beyond. Hoping to have it replace the current parport bit-bang set up as soon as possible!

There's 'scope beside the machine, and root SSH if you want to play with some hardware. I am also on vacation for a bit (what could be nicer than staying home doing CNC stuff?).

What will it take to get the spindle control going?

if you mean for pncconf then just some coding time.
If you mean to do it your self that depends on what you are controlling and how you would like to control it.
PID control?
simple open-loop analog?
to a VFD?
some other controller?
basically I assume it will be just a variation of what is used for PWM control as far as software is concerned (substituting the 7i76 spindle component pins of course).