The PCI revision register is used to encode both the Mainpine PCI bridge (PBridge+) revision and the board's hardware revision.  To find the PCI revision register value follow this sequence;

Start -> Control Panel -> System -> Hardware -> Device Manager -> Multifunction adapters -> RockForceDUO+ 2 Port V.92/V.44 Data Fax Voice Modem -> Details -> Device Instance Id

Look for the 'REV_21' or similar and use the following table to decode;

'REV_21' - Mainpine PBridge+ Revision 2.0, Mainpine Hardware Revision 2.1
'REV_22' - Mainpine PBridge+ Revision 2.0, Mainpine Hardware Revision 2.2
'REV_31' - Mainpine PBridge+ Revision 3.0, Mainpine Hardware Revision 2.1
'REV_32' - Mainpine PBridge+ Revision 3.0, Mainpine Hardware Revision 2.2

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