Paul, use this:
c1 - c6 cartridges = Williams 64 mapping. c2 & d8 cartridges = turbosoft 64 mapping. x2 & prisma cartridges = Williams 64 mapping. other cartridges, use turbosoft 128 mapping.
in the *.car image, the mapper is not properly defined.
by means of the utility of "Disk explorer" opened an image of the disk "Schreckenstein (1985) (Ariolasoft) (DE) [a1] .atr" and I received a fatal error.
there is a version of this game in a look *.XEX file?