King's Valley I looks perfect, fast & smooth and the fact that is a SCC less cartridge helps a lot 
Anyway I don't have a clear idea of how works the patching, do you need a individual patching for every game?, if you have a Aleste/MSX BIOS maybe you can try to execute the games as they are. If the games makes only use of BIOS routines, they could work.
King's Valley I looks perfect, fast & smooth and the fact that is a SCC less cartridge helps a lot
Anyway I don't have a clear idea of how works the patching, do you need a individual patching for every game?,
Not realy. The problem of 'patching less' emulation is problems to make hardware (or softtware) replacing the MSX based code to CPC based code.
Actually that is possible by some intelligent smart tool (patcher). But this could be complex so we need to find reasons to do it.
if you have a Aleste/MSX BIOS maybe you can try to execute the games as they are. If the games makes only use of BIOS routines, they could work.
Aleste BIOS has behave MSX BIOS, But game's bios litle bit different. Also bios is different from game to game.
Other thig there is not only BIOS patched but the main game loop also, cause it should have execute VDP emulator.
And I think VDP emulator is simplified for example tables witch can be relocated by VDP at the game used as fixed, them emulator has defined it as constants.
What this technology for I explained at previous message. And it does the job:
1) lets port MSX games rapidly.
2) And it can be used to create full emulation of MSX with double Z80 or Z80 + other DSP or CPU.
So it can be cheaper that make hardware clone.
