Using Network interface: en1 (no description) […]
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Using Network interface:
en1
(no description)

Unable to open the interface: BIOCSRTIMEOUT: Invalid argument.

This is caused by an issue inside libpcap. The code of pcap-bpf.c needs to be revised to suit modern OS X kernel data structures.

Anyways.. H-A-L-9000s NE2k patch now works on OSX/INTeL too. 😀

http://www.spam-filter.de/dosbox/dosbox_ne2000