Arcade Perfect Port

A notion that's been left behind as videogame consoles have increased in power and arcades themselves have faded into obscurity, this used to be the touchstone of any arcade conversion to home computer or console. An Arcade Perfect Port was a port of a videogame that was touted to be completely indistinguishable from its source.

Most 16 bit systems could reasonably claim that they could do arcade-perfect versions of early 8 bit arcade games, and these days most arcade games more than 10 years old can be said to be arcade perfect on modern home computers and consoles thanks to emulation, but the claim was made for many games that couldn't truthfully be said to be arcade perfect.

Actual

 * The majority of games of MAME, the multi arcade machine emulator. Which is only to be expected, as they're ROM images of actual arcade game chips.
 * Sega Saturn versions of Space Harrier, Out Run, Bubble Bobble, Rainbow Islands, New Zealand Story
 * All Neo Geo games, being as the home console had identical hardware to the arcade system
 * The Dreamcast versions of Marvel vs. Capcom 1 and 2. Both of which had little to no load times.
 * All game in the Soul Series except III are better-than-the-arcade enhanced ports, featuring resampled music, buffed-up graphics, additional game modes, and more.
 * Both the R-Type and R-Type II ports are perfect in the R-Types compilation, aside from some loading screens, a transparent HUD, and a higher frame rate.
 * For the Sega Genesis's 32X add-on, Sega released perfect versions of its arcade games After Burner II, Space Harrier and Star Wars Arcade.

Claimed

 * Mega Drive Strider, Ghouls 'n Ghosts
 * While Final Fight CD for the Mega CD is not as arcade perfect as it is claimed to be (the graphics are less colorful, the music is remixed with no option for the original version and the attack speed of Cody and Guy are slower than in the arcade), but it did have not only all three characters (SNES owners were forced to buy a second version of the game if they wanted Guy), but also the 2-Player co-op mode and the Industrial Area stage.
 * Street Fighter II Turbo: Hyper Fighting for the SNES has smaller sprite sizes compared to the arcade version (resulting in many of the characters' moves having different properties) and the flaming oil-drums bonus stage has been replaced by a generic brick-breaking stage (which was also in the SNES version of World Warrior), but the game is otherwise a decent adaptation of the arcade game.
 * Lots of Sharp X 68000 conversions: Parodius, Final Fight, Street Fighter II, Ghosts N Goblins. The X68000 couldn't quite handle arcade-perfect versions of After Burner II and Thunder Blade, though they were still technically superior to all other contemporary ports.