Apple PowerBook 520 Technical Information Page 70

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CHAPTER 4
Expansion Modules
56 Modem Expansion Card
Figure 4-13 Restricted areas on bottom of the PDS card
Note: Dimensions are in millimeters.
Modem Expansion Card 4
The modem expansion slot in the PowerBook 520 and 540 computers is designed for a
coprocessor card. The modem slot provides a superset of the PDS connector signals. Like
the PDS card, a card installed in the modem slot can have a configuration ROM and
emulate a NuBus card through the Slot Manager interface. The modem slot interrupt
maps to NuBus slot $B.
To monitor sound through the computer’s speaker, a modem card sends digitized sound
data to the sound interface by way of the data bus and the Whitney IC. The Sound
Manager has been modified to support such transfers of sound data.
The PowerBook Express Modem II, available in the U.S. and Canada, is a 14.4kbps fax/
data modem; it supports the CCITT V.32bis and V.42bis standards as well as industry
standard MNP5.
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