I n s t a l l i n g a n d U s i n g t h e A v i d E x p a n s i o n C h a s s i s
C h a p t e r 1 • O v e r v i e w
3
Macintosh Compatibility and Slot Limitations
Not all Macintoshes use the same NuBus architecture. Although the Expansion
Chassis has an additional 12 external NuBus slots, you cannot use all of the slots
because of NuBus architecture limitations (some slots in the Macintosh and the
chassis are duplicates). For the Macintosh models that can connect to the
Expansion Chassis, you can only use from nine to 13 slots between the Macintosh
and the chassis.
As a result, you must configure the Expansion Chassis for each Macintosh model.
Table 1 lists the Avid-supported Macintosh models and the maximum number of
available slots between the Macintosh and the chassis (excluding the slot used for
the chassis interface card).
Each NuBus slot inside the Macintosh and Expansion Chassis has its own unique
slot ID number or letter. Sixteen slot IDs are available and, of these, Apple reserves
two for its own use. In addition, you can’t use the same slot ID number for more
than once.
There are several duplicate NuBus slots in the Macintosh and the Expansion
Chassis. For example, the NuBus slot labeled ID C is a duplicate slot — it appears
in both the Macintosh and the chassis. Therefore, you can only install a NuBus
card in slot C in the Macintosh or slot C in the chassis. You can’t install NuBus
cards in slot C in both the Macintosh and the chassis.
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Installing NuBus cards in slots that have the same slot ID in both the Macintosh
and the chassis can cause serious system errors. Your Macintosh may also not
power up correctly.
Table 1: Maximum Slots Available
Macintosh
Slots Available
Quadra 900
11
Quadra 950
11
Quadra 650
11
Power Macintosh 8100
10
Summary of Contents for EXPANSION CHASSIS
Page 1: ... INSTALLING AND USING THE AVID EXPANSION CHASSIS HARDWARE GUIDE ...
Page 10: ...x Contents Installing and Using the Avid Expansion Chassis ...
Page 18: ...6 Chapter 1 Overview Installing and Using the Avid Expansion Chassis ...
Page 30: ...18 Chapter 2 Populated Chassis Installation Installing and Using the Avid Expansion Chassis ...
Page 58: ...46 Chapter 3 Empty Chassis Installation Installing and Using the Avid Expansion Chassis ...
Page 90: ...78 Chapter 6 Chassis Troubleshooting Installing and Using the Avid Expansion Chassis ...