> My bbca.zip file only contained the following: > basic2.rom > os12.rom > > which was enough for the machine to load in MAME. > > But adding the missing files causes -verifyroms to work - thanks Pernod. > > But why did -verifyroms report 'ROM not found error' rather than ROM is found but > contained missing files? It is because bbca is a clone of bbcb? > > Thanks, > Kranser The ZIP is not the Rom. The ROM file is the rom. Your Zip was missing Roms, hence the message.