LC 475, Performa 475 & 476, Quadra 605: Expansion Slot

The expansion slot in the Macintosh LC 475, Performa 475 and 476, and the Quadra 605 is not a true 040 PDS slot because it does not directly access the microprocessor bus. The expansion slot is an LC III compatible expansion connector: most cards that work with LC II, LC III, and LC 520 work with these systems* Examples: Ethernet cards for the LC Family, video cards for the LC family, and the Apple IIe Card.

Cards that are 030 specific, such as 030 accelerators or 030 cache cards, will not work with these models because they require direct access to the 68030 microprocessor. Those cards are intended to speed the 68030 microprocessor to higher performance levels that are already attainable with the 68040 microprocessor. However, accidentally plugging in an 030 accelerator or cache card will not cause any damage to your Macintosh.