Sinclairean will fail RLD/RRD tests on the z80tests.tap test suite because they expect an unmodified copy of the original Sinclair 16/48K ROM, and the emulator loader patches the tape handling routines at the first .tap file access request.
To circumvent thit situation, you may convert the .tap file into a .sna snapshot (for your convenience, it's bundled on the current Sinclairean distribution) and load it before anything else.
