There was no 11/380 but there was an 11/780.

Apparently, the only place the VAX 380 exists is in a writing sample by Pearson Education. Otherwise, there is no evidence of DEC ever producing something called "VAX 380".

https://www.pearsonhighered.com/assets/samplechapter/0/2/0/5...

	▲	Suzuran an hour ago \| parent [-]
		It looks entirely made up because the procedure described is also entirely alien to me, and I had professional experience with both VMS and Ultrix when they were still supported by DEC. (And it's certainly not BSD...)