From: slavotinek@gmail.com   
      
   The location and extent of the VPD info depend on the system.   
      
   The systems with the T4 complex have some of the info stored directly in   
   the flash BIOS image (the update procedure copies this unique   
   information to the new image on the BIOS update). I'd have to check to   
   refresh my memory but IIRC this consists just of the complex S/N and   
   FRU. Planar S/N (and FRU?) together with the system unit S/N are in the   
   EEPROM. Some of this information is replicated in the NVRAM together   
   with some unique data. That is how the system can tell that the   
   processor complex was changed, even if you replace it with the exact   
   same type.   
      
   The 85 K/N BIOS image contains the VPD structure, but I don't think this   
   is actually used. It probably uses just the EEPROM and NVRAM.   
      
   Lacuna's BIOS image doesn't have the VPD struct. and uses EEPROM and NVRAM.   
      
   The ROM/IML systems w/ the planar EEPROM most likely use the same scheme   
   as well.   
      
   You can check what VPD data is available in the "Display Revision   
   Levels" part of the system programs.   
      
   On 01.02.2023 19:33, Louis Ohland wrote:   
   > VPD = CPU?   
   >   
   >   
   >   
   > IBMMuseum wrote:   
   >> I think IBM is referring to support of the Intel 486DX2-66 CPU with   
   >> Write-Back cache (S-spec 'SX955') on the Bermuda - I don't remember   
   >> how I was testing the CPU I had. There might be a typo for the 'SX954'   
   >> S-spec (486DX2-50 with WB cache), since it would be the same stepping   
   >> as 'SX955': https://www.ardent-tool.com/CPU/486_Step.html   
   >>   
      
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