Most likely because those 2 aren't on the MAME db (Lashek would need to confirm if this is the case), that's due to both games being marked as not playable on the MAME driver info. I know that both of them had several issues, SWA for example wouldn't play the music due to MPEG patent restrictions and the skeleton device for Z80 MPEG sound board was only added on 145 and is probably still far from being implemented.
Still if you think they are good enough to be considered playable I'll add them to the MAME db, this is the kind of feedback I need in order to tweak the filtering system. Lmk the other games that also went MIA and I'll have a look at those as well.



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