Until he gets around to adding this and that, which takes time, try using MESS/MAME which is complete with ADAM support.
There are various other emulators out there like this one
It has a few sound issues but has F18A, Super Game, Mega Cart and Zx81 31 in 1 rom support.
This one is my favorite and I use it for my development because it is drag and drop, scalable, no toying around.
Debugger, Screenshot, definable keys for all controllers.
I am in contact with the author and it is still being worked on and it is 100% FREE.
It seems to have been programmed in a modern language, you need no libraries, no support files, an all in one executable.
Exactly what you want in a program for the 21st century.
As I mentioned, it has a few bugs but at the same time I've played a bunch of super games on it with zero issues other than sound.
Then of course is the Blue MSX which has not been updated in years.
Edited by Mike Harris, Tue Jan 22, 2019 1:15 PM.