Scsi-2 Interface; Ethernet Interface; Parallel Port; Serial Ports - Silicon Graphics POWER CHALLENGE User Manual

I/O Interfaces

SCSI-2 Interface

The IO4 contains two 16-bit SCSI-2 device controllers. Each controller can
operate with a bandwidth of up to 20 MB per second and can be configured
for either single-ended or differential operation.
To accommodate extra SCSI channels, optional SCSI mezzanine cards
contain three 16-bit SCSI-2 controllers. Two of the controllers are differential
only; the third is configurable as single-ended or differential. These
controllers are identical to those used on the main IO4 board.
SCSI mezzanine cards can be plugged into either or both of the mezzanine
card slots on an IO4 board, allowing up to eight SCSI-2 controllers per IO4
board. With the optional visualization console the GCAM covers one of the
available mezzanine connectors on the standard I04. This leaves room for a
maximum of one optional SCSI mezzanine board on the first I04 (three extra
SCSI connectors).

Ethernet Interface

The IO4's Ethernet interface operates at the standard Ethernet rate of 10 Mb
per second and supports an AUI (15-pin) physical connection. The controller
is intelligent; it requires no direct CPU involvement when packets are
transmitted or received.

Parallel Port

The IO4 contains a DMA-driven parallel port capable of operating printers
or performing high-speed data transfer to or from external equipment at
rates up to 300 KB per second.

Serial Ports

The IO4 contains one RS-422 and three RS-232 serial ports, all of which are
capable of asynchronous operation at rates up to 19.2 Kbaud. The RS-422
port can be operated at 38.4 Kbaud, provided the RS-232 ports are not all in
use.
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