IBM 6889 - IntelliStation M - Pro, User Manual

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Devices and I/O Ports Descriptions
Parallel Port Setup
Parallel Port
Parallel Port Mode
Parallel Port Extended
Mode
Parallel Port Extended
Mode DMA
Parallel Port IRQ
The Parallel Port Setup menu shows the address, mode,
interrupt, and other settings for the built-in parallel port.
The parallel port address can also be set to Disabled if you
want to prevent unauthorized transmission of data to
devices attached to the port.
If you add adapter cards with parallel ports, an error
message will notify you if you have an address conflict
among the parallel ports. Ensure that each parallel port
has a different address. If you change parallel port
addresses in this menu, you might also need to make
changes in the software that uses parallel ports. For
instructions on changing your software, see the user's
guide or online information that comes with the software.
If the Parallel Port field is not set to Disabled, you can
choose an operational mode for the parallel port. You can
choose either Standard mode or one of the extended
modes (ECP, EPP, ECP and EPP, or Bidirectional). In
standard mode, you are limited to write-only
(unidirectional) mode. The extended modes are
bidirectional and will increase the efficiency of your
parallel port; however, the extended modes use recent
technology, which is not supported by some hardware.
The extended modes are:
Ÿ
ECP: The extended capabilities port (ECP) mode
provides higher speed data transfers than the Standard
mode. The ECP mode is used for high-speed printers
and other devices.
Ÿ
EPP: The enhanced parallel port (EPP) mode also
provides high speed data transfers. The EPP mode is
used for LAN adapters, disk drives, and tape backups.
Ÿ
ECP and EPP: This mode combines the capabilities of
the Extended Capabilities Port and Enhanced Parallel
Port modes. Select this mode if you have both ECP
and EPP devices connected to the parallel port.
Ÿ
Bidirectional: This mode is used for data transfer to
other computers and supported devices.
The Parallel Port Extended Mode DMA field shows the
channel assignment for direct memory access (DMA). The
parallel port can use DMA data transfer when the
extended mode is set to either ECP or ECP and EPP.
The Parallel Port IRQ field shows the interrupt request
number.
Chapter 5. Configuration/Setup Utility Program
37