Specifications

CHAPTER 1
Introduction
Overview of Functional Capabilities 5
Processor Capabilities 1
The 12" card has a Pentium-class microprocessor that operates at a clock speed of
100 MHz and supports a 64-bit data bus. The 7" card has a 5x86-class microprocessor that
operates at a clock speed of 100 MHz and supports a 32-bit data bus. Both
microprocessors have internal L1 caches.
Since the microprocessors are different, the PC/PCI chip sets are also different. The
12" card uses an Opti chip set, made up of the 82C556, 82C557, and 82C558 ICs. The
7" card uses the Sis 5x86-SIS chip set composed of the 85C496 and the 85C497 ICs. The
BIOS is different for each card because of the different microprocessors and chip sets.
The main reason for using different microprocessors for the two cards is onboard space.
The Pentium-class microprocessor with its chip set requires considerably more space
than the 5x86-class microprocessor and its chip set. The Pentium-class microprocessor is
therefore not used in the smaller card.
Memory Capabilities 1
The 12" card has 8 MB of built-in DRAM. Memory capacity may be extended up to
64 MB using a 168-pin DIMM (dual inline memory module). The DIMM is plugged into
the DIMM slot on the card and expands total memory capacity up to 72 MB in two or
three 64-bit memory banks. The card also has a 256 KB cache memory.
The 7" card has 8 MB of DRAM, provided by a 168-pin DIMM, which plugs into the
DIMM slot on the card. To expand memory capacity for the 7" card, you can replace the
8 MB DIMM with DIMMs of higher capacity, up to a total of 64 MB. Memory on the
7" card is organized in 32-bit memory banks, up to a total of four banks. The card also
has a 128 KB cache memory.
Video Support 1
An ATI 264CT VGA (video graphics adapter) controller accelerator and onboard video
DRAM provide video support for fixed-frequency 12-inch to 21-inch monitors. Table 2-4
on page 23 provides a detailed list of these monitors.
The way in which the monitors are connected to the system varies, depending on the
Macintosh computer in which the 12" and 7" cards are operating. “GIMO Support for
Video Output” beginning on page 28 and “Loop-Back Video Support” beginning on
page 30 provide detailed information on this subject.
The cards have a DB26 connector. You can use the connector and a cable to connect a
second monitor that can be dedicated to the PC side of the system, while the Macintosh
computer’s DB15 connector supports the Macintosh display.
The DB15 connector on the cards does not support video but allows you to connect a
PC-compatible joystick or MIDI device, as described in “Joystick and MIDI Devices” on
page 8.