Just got this controller card in the hopes of replacing one of the chips to activate 4th axis capability.

I found some differences however.

1)The axis chips have different numbers on my old card as compared to the new one.

Is this going to cause problems when I try to activate the 4th axis socket?

2)My old card has a wire jumped in the empty socket. I wonder why?

3) There is an additional jumper on the new card labeled F1-F3. My old card doesn't have this.

The function of this jumper is not identified in the manual because as can be seen in my old card, it doesn't exist. The pin placement is there, but there are no pins so there's really no place for a jumper unless you soldered it in.

I was wondering what this (additional) jumper was for?

Thanks,
Alex