@MIRKOSOFT: Interestingly, the VDC is not usable at all, if an IDE64 is present. The VRAM goes mad, and almost every read/write attempt gets corrupted (it also conflicts to the I/O spaces of the GeoRAM and REU, so these had to be disabled). Maybe something similar is also with the SuperCPU (have you tried it also in the 1 MHz mode?).
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