That's indeed a pretty good indication the problem indeed lies with the player.
I suppose you're using Kari Lammassaari's Moonblaster player for Pascal? I took a small look at it and here's how to disable the turboR detection:
Load a Hex-Editor (DiskView on MSX will do fine) and edit the mbplayer.mpc file. Byte 0327h should contain 38h, change this to 18h.
This will make the player think it's always running on Z80.
Greetz, Patriek
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