Thank you for all the information, it was really helpful for new developers joining the party late like me
So now that we are able to run custom sized roms with mame and so on ; i've got more questions ^^
How to test and run this kind of custom cart roms on real hardware ?? (maybe it should be posted as another topic?)
In which order of magnitude can we extend different roms parts (named as 'data areas' (from neogeo.xml)
For instance , the vx roms (ymsnd data) can be extended to 16MB (i have read somewhere that 32MB should be possible in theory)
What about the cx roms (sprites data) ? what is the maximum 128MB? (i've read that it can also be extended with bank switching but i have no idea on how to do it)