If you get or do a full build of MAME they’re just in it. Try the `dn3500` system. ROMs will be wherever you get MAME ROMs and Domain/OS install tape images are

If you get or do a full build of MAME they’re just in it. Try the `dn3500` system. ROMs will be wherever you get MAME ROMs and Domain/OS install tape images are on Bitsavers.