Specifications

CHAPTER 4
Expansion Features
The PCI Bus Communications Slot 63
However, the signals on comm slot II in the Macintosh Performa 6400 computer are
configured to make it possible to design a universal communications slot card that
works in both comm slots if access to the parallel bus is not required (for example, a
serial modem card). The power, ground, serial, and audio signals of comm slot II in the
Macintosh Performa 6400 computer are located on the connector in such a way that a
dual-keyed (notched) modem card will fit and operate in the communications slot of the
Power Macintosh 5200, 6200, and 5400, the Macintosh LC575, LC 630, and the Macintosh
Performa 6400 computer. A simplified design diagram for a dual-keyed universal
modem card is shown in Figure 4-7.
Figure 4-7 Universal modem card for communications slot
IMPORTANT
Serial modem cards designed for universal operation must not attempt
to access the parallel bus of either the 68030 bus or the PCI bus
communications slots to be compatible in both configurations.
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Table 4-13 lists the pin assignments on a universal serial modem card that operates in
either the 68030 bus or PCI bus communications slots. The signal assignments are the
Pin number 1 location
odd pins on this side
Edge connector
Pin number 1 location
even pins on this side
RJ11
Secondary side
restricted component height,
see official drawing
Primary or
component side
6.0622
inches
1.8898
inches