TODO other recent non-wbox->wbox conversions
This is not an exhaustive list; some cores that were in development, but were never available in a release before being scrapped, are not included.
(A78) EMU7800
Removed in 2.2.1. Present in 1.x backports through 1.13.2.
(GBA) Meteor
Removed in 1.12.2.
(GBA) VBA-Next
Removed in 2.5.
(Genesis) GenesisHawk
Removed in 1.12.2.
(Genesis) Genplus-gx
Outdated Waterboxed port replaced with up-to-date Waterboxed port after 2.9.1. It was then wired up for SMS/GG.
Libretro
Our Libretro core adapter was rewritten in 2.9.
(NDS) melonDS
A non-Waterboxed melonDS port was replaced with a from-scratch (and Waterboxed) port in 2.7.
(NES) QuickNes
Our fork of QuickNes was replaced with eien86's quickerNES port in 2.10.
(Saturn) Yabause
Removed in 2.0. Present in 1.x backports through 1.13.2.
(SGB) SameBoy
The SGB core based on SameBoy was removed in 2.7. A Game Boy / Color core based on SameBoy was added in 2.8.