While the 2019 article is far from finished, I need a 2020 one to put any notes from 2020 in, so here is that article.
I imagine 2020 could be an interesting year for the project. 2019 really saw the project move into full stride with major work across the board, taking MAME into 2020 with a stronger sense of identity. That said, some of the things that were staples of the work in 2019 are now drawing to a close, for example, there are only a handful of Game and Watch titles yet to emulate such was the prolificacy of the work over the course of the previous years.
2020 could well turn out to be a year of learning, rather than a year of results so it will be interesting to see how this article develops.
Bad Dump Replacement
Identifying things that have been badly dumped is important, as it’s good to have on record proper dumps of things. When the GameKing emulation was improved last year a number of cartridge dumps that existed were found to be half size, this was corrected in early 2020. The redumped carts include 9 4-in-1 carts for which there was previously no good dump, and some alt revisions where there was already a good dump, but the redumped one was a different revision.