Lenovo PC 300GL Understanding Your Personal Computer 6267, 6277, 6287 - Page 29

Standard, Bidirectional, ECP/EPP, PC 300GL User Guide, extended, daisy-chain

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can use one of the diagnostic programs available with the IBM-preinstalled software package. Generally, you do not have to change the parallel-port setting. However, if you add a parallel adapter or use special hardware or software that causes a configuration conflict, you might have to change the parallel-port setting. You can change the setting using the Configuration/Setup Utility Program. Refer to the PC 300GL User Guide for more information about using this program. The parallel port can operate in five modes. One is a standard, unidirectional mode; the other four are extended, bidirectional modes that provide additional function and higher performance. Refer to the documentation that comes with printers and other parallel devices to determine the appropriate parallel mode to use and the required device drivers. Standard This AT-compatible mode is the default mode. In this mode, the parallel port is limited to writing information to the device attached to it. You can use this mode with most IBM-compatible parallel printers. Bidirectional This PS/2-compatible mode is a bidirectional mode used for data transfer to other computers and supported devices. ECP The extended capabilities port (ECP) mode is a high-performance, bidirectional mode that uses direct memory access (DMA) for data transfer to a high-speed printer or other devices. EPP The enhanced parallel port (EPP) mode is a high-performance, bidirectional mode that has capabilities similar to ECP mode; the main difference is that EPP data transfers are processor-initiated instead of DMA. EPP supports the connection of up to eight external devices such as hard disk drives, CD-ROM drives, tape drives, diskette drives, and a printer to the parallel port. These devices can be connected to each other in a daisy-chain arrangement, or they can be connected through an external multiplexer. The attachment of multiple devices requires device drivers supplied by the device manufacturers. ECP/EPP This mode combines the capabilities of the ECP and EPP modes. Select this mode if you have both ECP and EPP devices connected to the parallel port. Note: ECP, EPP, and ECP/EPP modes are available only if the port address is hex 378 or hex 278. You can set these modes of operation for the parallel port using the Configuration/Setup Utility Program. Refer to the PC 300GL User Guide for more information about using this program. To connect a parallel I/O device, such as a printer, use a parallel cable (purchased separately) to connect the device to the parallel connector at the back of the computer. Refer to the documentation that comes with your I/O device for specific installation instructions. I/O Features 21

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can use one of the diagnostic programs available with the IBM-preinstalled software
package.
Generally, you do not have to change the parallel-port setting.
However, if you add a
parallel adapter or use special hardware or software that causes a configuration conflict, you
might have to change the parallel-port setting.
You can change the setting using the
Configuration/Setup Utility Program.
Refer to the
PC 300GL User Guide
for more
information about using this program.
The parallel port can operate in five modes.
One is a
standard,
unidirectional mode; the
other four are
extended,
bidirectional modes that provide additional function and higher
performance.
Refer to the documentation that comes with printers and other parallel
devices to determine the appropriate parallel mode to use and the required device drivers.
Standard
This AT-compatible mode is the default mode.
In this mode, the
parallel port is limited to writing information to the device attached to
it.
You can use this mode with most IBM-compatible parallel printers.
Bidirectional
This PS/2-compatible mode is a bidirectional mode used for data
transfer to other computers and supported devices.
ECP
The extended capabilities port (ECP) mode is a high-performance,
bidirectional mode that uses direct memory access (DMA) for data
transfer to a high-speed printer or other devices.
EPP
The enhanced parallel port (EPP) mode is a high-performance,
bidirectional mode that has capabilities similar to ECP mode; the main
difference is that EPP data transfers are processor-initiated instead of
DMA.
EPP supports the connection of up to eight external devices
such as hard disk drives, CD-ROM drives, tape drives, diskette drives,
and a printer to the parallel port.
These devices can be connected to
each other in a
daisy-chain
arrangement, or they can be connected
through an external multiplexer.
The attachment of multiple devices
requires device drivers supplied by the device manufacturers.
ECP/EPP
This mode combines the capabilities of the ECP and EPP modes.
Select this mode if you have both ECP and EPP devices connected to
the parallel port.
Note:
ECP, EPP, and ECP/EPP modes are available only if the port address is hex 378 or
hex 278.
You can set these modes of operation for the parallel port using the Configuration/Setup
Utility Program.
Refer to the
PC 300GL User Guide
for more information about using this
program.
To connect a parallel I/O device, such as a printer, use a parallel cable (purchased
separately) to connect the device to the parallel connector at the back of the computer.
Refer to the documentation that comes with your I/O device for specific installation
instructions.
I/O Features
21