In this channel so am i adding mostly game related videos, ATM so is much from Atari ST (both games and demos).
I always try to record from the original hardware and from non-cracked/modified copies of the games, if i use emulators or cracked copies then i clearly mention this in the description.
And since i usually don't edit the videos so will they show the loading times also (see the horror examples Out Run and Turbo Out Run for Atari ST) but i tend to reward those that read the description with a shortcut link that goes directly to gameplay :-)
The game music "videos" is also recorded from the real sound source... once again i have much info in the descriptions so always read that :-) Screenshots and such might come from emulators though.
I have the following game/computer hardware that i record gameplay/demo videos from using video capture devices:
RGB:
Atari ST
Amiga 500
Amiga 1200
Acorn Archimedes A3010
Many arcade games
PC-Engine
S-Video:
C-64