Datapath VSN890 - Manual (Page 10)

Fig.6
Changing the BIOS for Image4 64bit Operation
Your VSN890 is capable of displaying 64 channels when using a 64bit compatible Datapath Image4-64
card, however this requires setting for 64bit operation.
When the Image 4-64 cards are used the Portwell ROBO-8120 BIOS can be placed in either 32bit or 64bit
enabled modes using the BIOS option Enable4G Decode.
To enable 64bit operation, enter setup from the boot screen by pressing as prompted.
In the BIOS setup utility select:
Advanced>PCI Sub System Settings>Above 4G Decoding
Disabled = 32bit operation
Enabled = 64bit operation
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If 4G Decode is selected (Enabled) this increases the number of Image4-64 cards that can be installed as
they are now mapped into an extended address space.
There is however a restriction when using the Image4-64 in 64bit mode. In 64bit mode the VGA BIOS
does not support a boot output, therefore when this 0ption is selected the IGD option should be
configured (Page 9) to ensure that a boot output is available.