Peripheral Setup 4-29
BIO
S
Se
tu
p
Onboard Parallel Port
There are four optional items used to control the onboard parallel port interface
while the user selects the I/O base address manually:
Parallel Port Mode
,
EPP
Version
,
Parallel Port IRQ
, and
Parallel Port DMA Channel
. The following
lists the available options of the onboard parallel port:
Auto
à
LPT port I/O resources assigned automatically
Disabled
à
onboard parallel port function is disabled
378h
à
IRQ7 for this default I/O address
278h
à
assign this I/O address to LPT1
3BCh
à
assign this I/O address to LPT1
Parallel Port Mode
:
This option specifies the parallel port mode.
ECP
and
EPP
are both bi-directional
data transfer schemes that adhere to the IEEE 1284 specifications. This parallel
port mode includes four options:
Normal
,
Bi-Dir
,
EPP
, and
ECP
. The optimal
default setting is
Bi-Dir
.
Setting
Description
Normal
Uni-direction operation at normal speed
Bi-Dir
Bi-direction operation at normal speed
EPP
The parallel port can be used with devices that adhere to the
Enhanced Parallel Port (EPP) specification. EPP uses the exist-
ing parallel port signals to provide asymmetric bi-directional
data transfer driven by the host device.
ECP
The parallel port can be used with devices that adhere to the
Extended Capabilities Port (ECP) specification. ECP uses the
DMA protocol to achieve data transfer rates up to 2.5 Megabits
per second. ECP provides symmetric bi-directional
communication.
