OK, worked this out.
I created an empty drawer and called it AmiTCP.
Made an assign for AmiTCP and pointed it at that drawer.
Installed Telser picking AmiTCP at the install prompt (it was looking for the AmiTCP assign before).
It breezed through installing all the necessary files and configs.
Thats it!
Rebooted and launched MiamiDX.
Loaded up NComm and was able to telnet out to my favorite bbs's.
Unsure about incoming telnet connections, but outgoing certainly works.
