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C.1.8.2 Parallel Port
The parallel port is supported by an IEEE 1284-compatible parallel port controller
that is located on the SuperIO component. The parallel port controller is a
PC-industry-standard controller that achieves a 2-megabits per second (Mbps) data
transfer rate. The parallel port controller interface supports the ECP protocol as well
as the following:
Centronics – Provides a widely accepted parallel port interface.
Compatibility – Provides an asynchronous, byte-wide forward (host to peripheral)
channel with data and status lines used according to their original definitions.
Nibble mode – Provides an asynchronous, reverse (peripheral-to-host) channel,
under control of the host. Data bytes are transmitted as two sequential, 4-bit
nibbles using four peripheral-to-host status lines.
Parallel Port Cables
The parallel port cable is IEEE1284 compliant and comprises 18 pairs of signal wires
that are double shielded with braid and foil. The maximum length of the parallel
port cable is 2.2 yards (2 meters).
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Sun Enterprise 220R Server Service Manual ♦ January 2000, Revision A