P4B (400MHz FSB, 3GB PC133 DIMM, 6x PCI, 1 CNR, Support SmartCard /Memory Stick /Secure Digital reader and Optional Audio)
- BIOS Upgrade and Road Map :

1005.zip 
P4B BIOS Ver. 1005 10/17/2001 
Fix system reboots itself when shutting down from Windows 2000 in APM mode. 
Fix system can not boot up with RAMOS RM28S180TA-13AC 128MB 133MHz SDRAM.