TYAN Tomcat i945GM S3095, User Manual

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Onboard Parallel Port
To use the parallel port on the system, select an address and corresponding
interrupt for the parallel port.
•
378/IRQ7
• 278/IRQ5
• 3BC/IRQ7
• Disabled
Parallel Port Mode
This field allows the user to select the parallel port mode. The default value is
SPP that automatically selects the correct mode to use. The other modes are
explained as follows:
SPP works with all parallel port devices. However, it is the slowest transfer
mode and should only be used when faster transfer modes cannot be used.
There are two faster bidirectional modes available - the ECP (Extended
Capabilities Port) and EPP (Enhanced Parallel Port) modes.
ECP uses the DMA protocol to achieve data transfer rates of up to 2.5Mbytes/s
and provides symmetric bidirectional communication. On the other hand, EPP
uses existing parallel port signals to provide asymmetric bidirectional
communication.
For those who don't know what mode to select but at least know that their
parallel port device supports bidirectional transfers, the BIOS offers the
ECP+EPP mode. If you select this mode, then the parallel port device will be
able to use either one of those modes. However, this should be considered as a
last resort as you may be needlessly tying up an IRQ for nothing if your device
does not use ECP at all. Or, the BIOS may not select the best parallel port
mode for the device. If possible, set the parallel port to the transfer mode that
best suits your parallel port device.
• SPP
• EPP
• ECP
• ECP + EPP
EPP Mode Select
There are two versions of the EPP transfer protocol - EPP1.7 and EPP1.9.
Generally, EPP1.9 is the preferred setting because it supports the newer
EPP1.9 devices and most EPP1.7 devices; and offers advantages like support
for longer cables. However, because certain EPP1.7 devices cannot work
properly with an EPP1.9 port, this BIOS feature was implemented to allow you
to set the EPP mode to EPP1.7 when such an issue occurs.
Therefore, it is recommended that you set this BIOS feature to EPP1.9. But if
you have trouble connecting to your parallel port device, switch to EPP1.7.
• EPP1.7
• EPP1.9
ECP Mode Use DMA
This BIOS feature determines which DMA channel the parallel port should use