Does it work with poseidon usb-ethernet adapters? IIRC there was some problem on OS4 using Roadshow+Poseidon because it was mandatory to use a file based device (and in contrast Poseidon created the network device in memory so choosing it was not possible)
Whatever it is, it is AOS4 introduced horror (which can be worked around by creating a dummy zero byte file of same name as the memory-created device in DEVS:Networks). As the Roadshow config is text based, it is easy to configure it for USB based devices. I successfully have tried the Roadshow demo since 2003 (for use with Norway, later for the USB adapters).
Roadshow is the most performant TCP/IP stack I've seen. With the Deneb and ASIX USB adapter I reached transfer rates of over 1200 KB/sec, if I remember it correctly (measured with TCPSpeed).
Congrats to Olsen for finally releasing it.