Ecole.dsk does need the r52 reset instruction AND a RAM write when writing in ROM (RAM is beside ROM, hard to emulate with asynchronous RAM, MiST does use a hacked synchronous RAM done for that), but not all screen is displayed, music is OK in MiST.
A lot 50% of CPCRULES demos don't pass, are running in fact I didnMiST FPGAmstrad't find one s version (a lot of not passing ones are using the double-buffer VRAM that pass damnneeds more than 16Ko).I do
Others bugs are about dsk format, in fact a dsk is uncompressed into RAM at startup, so all dsk access are direct: