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Values for DECnet DOS Data Link Layer function:
 00h	initialize
 01h	open portal
 02h	close portal
 03h	enable multicast address
 04h	disable multicast address
 05h	transmit
 06h	request transmit buffer
 07h	deallocate transmit buffer
 08h	read channel status
 09h	read datalink portal list
 0Ah	read information about a datalink portal
 0Bh	read and/or clear counters
 0Ch	request to boot from a network server
 0Dh	enable Ethernet channel
 0Eh	disable Ethernet channel
 0Fh	start MOP/send a System ID message
 10h	stop MOP
 11h	get DECPARM
 12h	set DECPARM
 13h	external loopback