>But as of right now is there any games that have been removed and still not been added > back since 0.143?
Pong.........because Nicola [MAME founder and project coordinater then] said so way back around December 1999.
-- 0.36 RELEASE CANDIDATE 1
The last driver removed is Pong, which at this point was too much of a simulation and too little of an emulation. It didn't really fit into MAME's architecture which is CPU-based and targeted at accurately reproducing the gameplay of the original.
That was a difficult decision to make, but thankfully I won't have to bother about these things anymore in the future. Gotta go now! *waves* - Nicola Salmoria --
>I don't need to know which games they are unless your allowed to say or maybe how many.
There is nothing being secretly hidden away in MAME source. It's all out in the open after the long ago "Test Driver" concept was phased out by David H. many years ago.