Specifications

CHAPTER 1
Introduction
6 Overview of Functional Capabilities
▲
WARNING
Do not connect a monitor or other video device to the DB15 connector
on the 12” and 7” cards. ▲
Audio Support 1
The 12" and 7" cards provide enhanced sound capabilities that are compatible with 16-bit
stereo Sound Blaster Pro capabilities. The audio circuitry, which consists of a Creative
Technologies Vibra 16S 16-bit audio chip and the Yamaha OPL3 FM synthesizer chip set,
enables the cards to provide audio output compatible with the Sound Blaster Pro and to
mix PC sound output with the sound output of the Macintosh host computer.
Note
Sound Blaster Pro products developed by Creative Technologies
support sound systems in PC-compatible computers. Their hardware
and software specifications have become de facto standards in the
industry.
◆
Each card has two audio connectors, one for input and one for output. Audio inputs
from such sources as CD players are transferred to the cards via the Macintosh main
circuit board. Sound outputs from the cards are transferred to the sound system on the
Macintosh’s main circuit board, to external speakers, or to an external audio jack. You
can use these connectors with most Macintosh computers in which the 12" and 7" cards
may be installed.
Some Macintosh computers do not support this type of audio connection. In this case,
audio inputs and outputs may be transferred between the CPU and the cards by means
of the GIMO connector and Berlin adapter card described in “GIMO Support for Video
Output” beginning on page 28. Currently it is computers with smaller enclosures (for
which the 7" card is designed) that use the GIMO connector to transfer audio inputs and
outputs.
PC beeps generated by the PC subsystem generate a line level audio signal that is
summed into the Macintosh audio subsystem or the CD-ROM audio path. You can also
disable PC audio if you prefer.
I/O Support 1
A PC/PCI chip set provides an integrated solution for the AT-compatible I/O.
Conventional ISA expansion is not allowed; refer to “XD Connector” beginning on
page 52 for further information on this subject.
The 12" card has the Opti chip set composed of the 82C556, 82C557, and 82C558 ICs. The
7" card has the Sis 5x86-SIS chip set composed of the 85C496 and 85C497 ICs. These chip
sets, in conjunction with a custom IC, referred to in this document as the Mustard ASIC,
provide the I/O support required by the cards for Macintosh floppy disk and hard disk
drives, the Macintosh serial ports, and the Macintosh keyboard and mouse.