Quote Originally Posted by Palletlad View Post
Once confirmed if it is the pc's onboard LPT connection causing the missed steps then for a beginner would the UC100 be enough for me?
Or would the UC400 still be advised (I only be using 3 motors for a while as being a beginner) so the UC300 would be wasted on me to my understanding.
The UC100 is essentially a direct replacement for a single parallel port.
The other similar option is a PMDX-411, but that's limited to Mach4.

The comments about USB are valid, but bear in mind, the percentage of people who actually have problems is very slim. From what I remember, one of the original USB Smoothstepper sellers estimated it was under 2% of people who had problems. Newer USB devices do seem more reliable.