Since we're discussing impressive PC games from the 80s, I want to bring up Alley Cat. Besides being a very entertaining game that still holds up (well, if you can bare the PC Speaker beeps and boops), it is also a PC booter like the games mentioned in the post (ported from Atari).

Alley Cat had a very neat trick on the PC: it implemented its own clock independent of the CPU cycles. At the time, many games relied on counting CPU cycles to tell the time. This caused a problem when the next generation of PCs came out with a faster CPU (XT with 286 if I recall), because now the cycles went by much faster, making the games run insanely fast so it was impossible to play (fun sidequest: the Turbo button was supposed to help in this sort of situation). Alley Cat had no such issue since it implemented its own clock, and it can still run today at normal speed just as it did over 40 years ago.

PC-MAN did the same thing - except for the LOOP $ delay loops used for the opening screen.

Alley Cat has a timing issue with the “kiss” noise used at the end of the Felicia screen and the “conflict” noise when you run into the dog.