There is a printer port driver for Mach4(available as an add-on license from Art Fenerty), but it has some limitations as to what OS it can run with.
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Your C11G is designed to work with a printer port, but many motion devices(the Ethernet Smoothstepper, for instance) essentially have printer ports on them. Your C11G will work with an ESS.
I now see my mistakes running Mach 3 and not Mach 4. I have already bought electronics comparable with Mach 3. I was trying to keep it simple and now I have created some problems. The BOB I bought uses a parallel port (C11G) so it wont work with Mach 4 as I believe. I havent worked with Mach 3 in 15 years so real rusty there too.