I had the chance to have my first account on a real computer on a PDP-11/34 running some old Unix version. Lisp was crashing all the time.
Then I had an account on a DEC20 running TWENEX. That was fun. I became fluent in PDP-10 assembly.
At the same time I was fighting to understand C on a MicroVax II running... Ultrix.
It wasn't super fun to port code from a VAX to a HP1000 running RTE-6/VM, located in a machine room next to 4381 IBM's.
The PDP-11/34 was upgraded to a VAX11/750 running BSD4.3 I liked this machine. Especially when I was the only user on it.
Later on, the Sun Microsystems Workstations Sun3's were so fun to use, with no UNIBUS but VME cards and Motorola powered. Hards disks were large and heavy, SMD interface, with huge capacities, like the CDC ones.
SPARC cpu was born, and the SS2 was a nice Pizza box. Lot's of SCSI problems at thhe same time.
From there, I can't remember anything, I remember the words Solaris, but not the one from Tarkovsky. DEC became Compaq which became HP, which became shit, just like Sun became Oracle. and now out world is populated with too complicated machines for me. Not only for me I think. I can explain you how a VAX boots, but I can't find anyone who can tell me how a PC boots Linux.
Unix 4.3BSD was fun. Slow, but fun. SunOS was cool. Then came Linux, and an his army of fans.