@Dafix First of all, Xemu (C65 or M65 emulator) does not emulate the border - yet :) Well, besides of that the command "should" work, maybe you can't see the result though :) But the important point: the BASIC interpreter is the original ROM, so if it says an error message like this then it's nothing to do too much other than the ROM/basic itself, let it be on the emulator or the FPGA realization ... Surely, Xemu for emulating C65 (and especially M65) is kinda "young" in terms of maturity, that's true, however I think, this must be some kind of BASIC problem. Btw, it seems, BACKGROUND command has similar behaviour.


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