NuBus cards would not fit into the compact design of the Macintosh SE/30. The NuBus also requires additional logic circuitry for which there is no room on the Macintosh SE/30 logic board.
Expansion cards designed for the Macintosh SE/30 can provide better performance at less expense because they can be optimized. Additionally, the 030 Direct Slot supports the same software drivers designed for NuBus cards.
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Why did Apple not use NuBus in the Macintosh SE/30?