Intel P43 User Manual page 40

Half (default). Full-duplex means that you can transmit and send information simultaneously.
Half-duplex is the transmission of data in both directions , but only one direction at a time.
Onboard Parallel Port
There is a built-in parallel port on the on-board Super I/O chipset that Provides Standard, ECP,
and EPP features. It has the following option:
Disabled
(3BCH/IRQ7)/
(278H/IRQ5)/
(378H/IRQ7)
Parallel Port Mode
SPP : Standard Parallel Port
EPP : Enhanced Parallel Port
ECP : Enhanced Com Port
SPP/EPP/ECP/ECP+EPP
To operate the onboard parallel port as Standard Parallel Port only, choose "SPP." To
operate the onboard parallel port in the EPP modes simultaneously, choose "EPP." By
choosing "ECP", the onboard parallel port will operate in ECP mode only.
"ECP+EPP" will allow the onboard parallel port to support both the ECP and EPP modes
simultaneously. The ECP mode has to use the DMA channel, so choose the onboard parallel
port with the ECP feature. After selecting it, the following message will appear: "ECP
Mode Use DMA" at this time, the user can choose between DMA channels 3 to 1. The
onboard parallel port is EPP Spec. compliant, so after the user chooses the onboard parallel
port with the EPP function, the following message will be displayed on the screen: "EPP
Mode Select." At this time either EPP 1.7 spec. or EPP 1.9 spec. can be chosen.
Line Printer port 0
Line Printer port 2
Line Printer port 1
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Choosing