I have no experience with MACH3 - but I have been on the edge of skipping my DSP for a MACH3 setup.
However, I have learned from others that MACH3 may be hard to put up
on a machine. I have looked at several other options and here is one that
seems to work a lot better. You do not need to put the machine in to which
ever mode to have the real time part working, this is ported out to a chip
on the break out board. SW could be downloaded for free and work in evaluation
mode without the break out board (I have looked at CPU4 board):
Check it out:
www.usbcnc.com
The man behind it, Bert, is the most responsive person I have been in contact
with and I'm almost 99% there to rip my controller out of my machine and
convert it to a PC setup WITHOUT the need of a old fart PC with a printer port
running in a delicate mode to have the real time part working...
Probably not the best advice you have received, but at least a option to consider
if you feel the need for a upgrade.
Kent