Apple Macintosh Performa 570 series - Manual (Page 101)

Closing the computer
1 Slide the logic board back in.
Push on the back edge of the logic board until it is firmly in place.
2 If there is a connector on the card that you just installed (for example, if you are
installing an Apple IIe Card), remove the access cover on the back panel you removed
earlier.
Pinch together the plastic tabs on the access cover to remove it and pop it out.
With the access cover off, you can use the port on the card you just installed.
If you installed a processor-direct slot (PDS) card, remove this access cover:
If you installed a communications card (Macintosh Performa 570 series only),
remove this access cover:
93 Installing an Expansion Card