Specifications

CHAPTER 1
Introduction
10 Compatibility Issues
other external devices, such as a VCR, without an optional video out card. For more
information, see the section “The DAV Connector” beginning on page 53.
Communications 1
The main logic board in the Macintosh Performa 6400 computer has a communications
slot that allows the computer to support a communications module without occupying
one of the PCI expansion slots. A communications card can be installed by either the
user or the dealer.
The communications slot in the Macintosh Performa 6400 computer uses a PCI bus,
rather than the 680xx bus. The following cards are supported:
■ the 10BaseT (twisted pair) ethernet card
■ the 10Base2 (thin coax) ethernet card
■ the AAUI (Apple standard) ethernet card
■ the 28.8 bps fax/data modem card
Expansion Bay 1
The expansion bay in the tower enclosure includes data, and power connectors for
adding another SCSI device. The bay is configured for 5.25-inch devices. However, with
modification to the carrier, a 3.5-inch SCSI device could be installed. For additional
information about the expansion bay mechanical and electrical characteristics see
“Expansion Bay for SCSI Devices” beginning on page 66.
Compatibility Issues 1
The Macintosh Performa 6400 computer incorporates several changes from earlier
desktop models. This section describes key issues you should be aware of to ensure that
your hardware and software work properly with this new model.
Communications Slot 1
The communications slot in the Macintosh Performa 6400 computer is a PCI bus
compatible slot (comm slot II) and is in general not compatible with communication
cards for the Macintosh LC family of computers, the Macintosh Quadra 630 computer, or
cards that operate in the communications slot (comm slot I) in Power Macintosh 5200
and 6200 computers. The exception is that cards that do not use the bus, such as serial
modem cards, can be designed to work in both comm slot I and comm slot II. For more
information about designing serial modem cards that are compatible with both
communications slots, see “The PCI Bus Communications Slot” beginning on page 59.