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21 device archives collected for MAME 0.289 are byte-identical to sets already held under another name: a set renamed in 0.289 (tms32030 to tms320c30, hardbox to gpib_hardbox) or one ROM set several devices share (sys68k_cpu21 family, voicebox). One copy stays and the other names go to the MAME clone map, through which each name still resolves.