Noob question probably - Any way to get these running on a 68k machine?

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Yes that is a "noob" question. All of those are 68K Macs. Thanks to equill's eloquent recitation of the system specs, you can safely expect to use these disks on any 68K Mac that will run System 7.5.5. Since these disks can be used on a 512K Mac, they are most likely 400K, meaning nothing above 7.5.5 will read them (7.6 will read them, but if anything needs to written to them, it will fail). The one marked Mac II in color, might be an 800K disk and should be accessible up to OS 9.2. However, the ones marked 512K are likely limited to how advanced a system they will run under, given that the 512K can't run over System 4.3, which is within a year of the minimum Mac II System support of 3.3. System 6 should run anything written under System 3 or above, and System 7 stands a good shot, but I wouldn't get my hopes up for System 8 and above. Your best bet is not to use the original disks in any event. 400K disks can be transferred to 800K disks for better compatibility with newer Macs (System 7 is supposed to work with 400K disks, but I wouldn't push it).