Hi,
there are a number of Mach4 users whom have a UC100 so it definitely does work. The UC100 is a single port equivalent, that
is 17 inputs and outputs, which is very restrictive.
A UC400 and PMDX-424 both have 34 IOs' an Ethernet SmoothStepper has 51 IOs, a 57CNC has 57 IOs, a UC300 has 85 IOs.
Not sure exactly how many a CSMIO and a Hicon have, but plenty.
As you noted all the UCnnn series are made by CNCDrive, the owners and manufacturers of UCCNC. They have a good Mach3 plugin for
all their motion controllers but the Mach4 plugin is weak on realtime supports. Given the competitive nature of the two companies I
don't see CNCDrive expending a lot of effort to improve their Mach4 plugins, when really they'd rather have customers buy UCCNC.
The other manufacturers have expended much more effort on their plugins to ensure maximum facility with Mach4, and include
Warp9TD, PMDX, PoKeys, Vital Systems. CSLabs deserve a mention but their Mach4 plugin lacks polish when not actually buggy. CSLabs
are trying to push their own software and the Mach4 plugin has suffered as a result.
Craig