Yeah in 1991 our college lab's MSDOS PC's were unsecured (unsecurable!?), so our prof quickly learned to regret teaching us how to write TSR's in ASM.
Ours had PS-2s on a token ring network with a TUI to get to the word processor etc but it also had a “drop down to DOS” option that the teachers didn’t know about.
I also got in trouble for playing Leisure Suit Larry in 6th grade computer class.
LOL brute-forced the "adult knowledge" questions at startup, huh?