Help choosing a good card setup

Thanks for clarifying Tommy.

Just realized I said I got the Leadshine mx3660. It's the mx 4660 I've got. Sorry for the confusion!

No problem, i do not know what any of those do as i never used them.
I tend to avoid those all in one things.

Just to throw an alternative in to the pot... You could cut one end off of a parallel port cable and individually wire the MX4660 inputs to a 7i76 step/dir and IO pins.

Aah that would have been a neat solution. Too bad I already have bought the two cards.

Having trouble getting the 7i84 working. I've got a red light on CR6 and trying to connect with mesaflash gives me this error.

mesaflash --device 7i84 --readhmid
( or mesaflash --device 7i84 --addr 10.10.10.10 --readhmid ??)
ERROR: Unsupported device 7I84

or with newer mesaflash from github.com/jethornton/mesaflash

./mesaflash --device 7i84 --readhmid
(or mesaflash --device 7i84 --addr 10.10.10.10 --readhmid ??)
ERROR: Unsupported device 7I84
No 7I84 board found

I've got all power in pins connected to 12v. (and gnd to gnd)
The manual says: CR6 Red Lower left Field I/O fault
It doesn't matter if LinuxCNC is running or not.
I have nothing set up yet, just trying to get all the cards running.
Can't find a solution with google.
The 7i92 has been flashed with 7i92_7i77_7i74D.bit (correct firmware?)
Both 7i92 and 7i74 have their own 5V supply.
I have tested a few different network cables, none are crossover.
Sserial has been installed for the 7i84.

I'm sure I've missed something..?

7i84 will not report anything with mesaflash, you have to check 7i92 in your case and it will show pins for 7i84, if it is wired and communicating properly.
Just remembered that even that might not work.
Can you start Linuxcnc ?
If yes, go to machine menu and choose configuratin something, that brings another screen, on the left choose pins, 7i92 and there you can see all the awailable pins.
It needs to be initialised before making pins visible, it can be done in hal only, but i can not recal the exact commands.