I'm unable to run Bloktris 1.03 on MSX :-( , nor on emulators, FPGA or "real" hardware. It just hangs.
I was able to run it with OpenMSX. It uses the
Konami 8K with SCC bank switcher.
But being a non-megarom it should't use any mapper. Just a plain rom. And it doesn't support SCC, right?