The 680x0 vector table, including the startup vector is at 0. 680x0 systems have the problem where you really want RAM there so the OS can change those vectors, but you also need ROM there so the system can power on in the first place. So it's super common for 680x0 systems to have some way to move ROM there at powerup and then have it go away again.
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Macintosh IIcx custom ROM
- Thread starter luRaichu
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