Excerpt of message (sent 20 August 2009) by Mark Abene: Serious? Are you actually emulating a DMC11? I'm intrigued... Yes. Or rather, the terminal driver contains an implementation of the DDCMP protocol. So it can talk to async DDCMP devices -- just as RSX did for years. Until V10, DECnet/E only did DMC/DMR type DDCMP devices. On a Pro, which has a USART (not UART) console port, it even speaks sync DDCMP if you want so it can talk to a DMC or DMR (and that works, I tested it). On other PDP-11s it will use any of the async lines and speak async DDCMP. paul