Specifications

Keyboard connector

There is one keyboard connector on the rear of the computer. Use this connector to

connect a PS/2 (non-USB) keyboard. The following illustration shows a keyboard

connector.

If you attach a keyboard to this connector, USB ports and devices are disabled

during the power-on self-test (POST).

Parallel connector

There is one parallel connector on the rear of the computer. Use this connector to

connect a parallel device. The following illustration shows a parallel connector.

The parallel connector supports three standard IEEE 1284 modes of operation:

standard parallel port (SPP), enhanced parallel port (EPP), and extended capability

port (ECP). If you configure the parallel port to operate in bidirectional mode, it

supports the ECP and EPP modes. When the parallel connector is configured as

bidirectional, use an IEEE 1284-compliant cable that does not exceed 3 meters (9.8

ft). Use the Devices and I/O Ports options in the IBM Configuration/Setup Utility

program to configure the parallel connector as bidirectional.

Serial connectors

There are two serial connectors on the rear of the computer. Use these connectors

to connect serial devices. The following illustration shows a serial connector.

Ultra320 SCSI connector

Your computer has an integrated SCSI controller. This single-channel controller

supports an independent, Ultra320 SCSI channel that supports up to 15 SCSI

devices. The SCSI connector for the channel is on the system board. The channel

supports up to 15 SCSI devices. This controller has the following features:

v Double-transition clocking to achieve up to 320 MB-per-second data-transfer

rates

v Domain name validation to negotiate compatible data-transfer speeds with each

device

v Cyclic-redundancy checking (CRC) to improve data reliability

v An active terminator for SCSI bus termination

SCSI cabling requirements

You can install four internal SCSI devices using the SCSI signal cable that comes

with some computer models. If you plan to attach external SCSI devices, you must

order an optional PCI SCSI adapter and external cable. To select and order the

correct cables for use with external devices, contact your IBM reseller or IBM

72 IBM IntelliStation M Pro Types 6220 and 6230: Hardware Maintenance Manual