It has it's own memory, I don't know if that is also main ram for z80 like in amstrad (allowing superb demogrfx see youtube)
If it works the same as on amstrad I will try to port a demo by altering the I/O ports. Who knows it might work as that cartrdige to play sega games 
Any freaks around utrecht/amsterdam can ofcourse come and play with it and program as I'm already working on another MSX project myself.
I think I have found the rom file. According to BlueMSX's rom database, the SVI-727 rom is the same as the Swedish SVI-806 rom. I have found two versions of the SVI-806 roms, one of them is Swedish. The sha1 also checks out.
Something very interesting shows up in these dumps:
Both feature the name of J. Suzuki, a programmer at ASCII who also worked on MSX-DOS!