• PortableSlotPresent flag tells if the machine has Processor Direct Slot for a Macintosh Portable.

• SE30SlotPresent flag tells if the machine has Processor Direct Slot for a Macintosh SE/30.

• SESlotPresent flag tells if the machine has Processor Direct Slot for a Macintosh SE.

• NuBusPresent flag tells if the machine has NuBus connector slots.

• SlotMgrExists flag tells if the Slot Manager is present.