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* TTY serial lines * NIA-20 ethernet interface * CI-20 cluster interface
IP version 4 is implemented in some distributions of tOPS-20.
* TELNET
* FTP
DECnet is the proprietary network protocol designedby Digital EquipmentCorporation for communication between diffrent hosts runnning operatingsytems such as TOPS-20, TOPS-10, VMS, RSX etc. Implementations exist also for other operating systems,such as Sun/Solaris and GNU/Linux.
* OPR/NCP
* SET HOST
Chasnet is an optional protocol designed primarily for communication with andbetween MITCADR Lisp Machines. implementations (maybe experimental) may exist for some TOPS-20 distributions.