4-30
BIOS Setup Information
Onboard Parallel Port
There are four optional parallel port modes used to control the onboard parallel port interface
when the user selects the I/O base address manually: Parallel Port Mode, EPP Version, Parallel
Port IRQ, and Parallel Port DMA Channel. The following are available options of the onboard
parallel port:
Auto
à
user can not control all of LPT port I/O resources
Disabled
à
onboard parallel port function is ineffective and NA
378h
à
locate 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 P1284
specifications. This Parallel Port Mode includes four options:
Normal
,
Bi-
Dir
,
EPP
, and
ECP
.
Table 4-9. Parallel Port Settings
Setting
Description
Normal
Uni-directional operation at normal speed
Bi-Dir
Bi-directional 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 existing 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
2.5MB per second. ECP provides symmetric
bi-directional communication.