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You can refer to this awesome Macintosh models timeline on Wikipedia for old world vs new world ROMS. This is an archive containing all of the most popular Macintosh models ROM files for emulation purposes, ranging from the first 64K ROM from the Macintosh 128K to the 4 MB ROM files from the Bandai Pippin or PowerMac G3, listed below in ROM size, then by release date from oldest to newest.
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