@Unknown I made the same mistake when I first started looking into building my first Retropie then remembered that the NeoGeo home console (AES) was essentially the same hardware as the arcade unit (MVS) but could only have one cartridge as opposed to the up to six cartridges of the cabinet.
@woutertron is there any chance that you use Discord chat, or would be willing to?
There is a libretro/RetrArch Discord server where all of the active mame2003-plus developers (as well as a lot of other RA and core devs) can be reached. This is a direct link to the Discord channel, where I can be PM'd or tagged in #programming: https://discord.gg/C4amCeV
@markwkidd thanks for your updates, one of these days I'd like to delve into romlister to filter out game types. I know floob had done some in the past but for the few people who filter Mame rom lists might be a useful tool.
But he did have a 240fps cam. I'm not sure if I can be bothered myself, it's just an idea. Overall it's all just out of curiosity and old benchmarking habits, which I have since the days of 3dfx cards :P I don't need this to prove anything to myself or others, since I can live with this lag as it is at the moment.
One test though I would definitely would like to conduct is to take some people who claim that are "sensitive" to lag and do some blind trials on multiple setups with various slight differences. I think the results could surprise a few, especially those who swear that 1 -2 frames of lag makes games unplayable for them :)
OK. I'll wait. I was intending to read the current code to understand how stuff works and contribute in some way. But if it is being rewriten, I think it's better to wait a little longer. Hope to see a little more commented code... :-)