Apple Power Macintosh 9600 - Manual (Page 107)

Installing an unusually long PCI card
If a 12-inch PCI card has long ports that make it difficult to insert into the
slot, it may be necessary to temporarily remove the speaker housing/card
guide assembly to install the card. Follow these steps to remove the speaker
housing/card guide assembly and install a PCI card.
1 Remove the speaker housing/card guide assembly as shown below.
(back of computer)
Sqeeze these two tabs and slide the speaker housing/
card guide assembly straight up.
107 Installing PCI Expansion Cards and Additional Memory