I thought I would mention it to the list before posting it on ebay. I need to go to the dentist in January. I am going to part with my last IBM Mainframe 3084 chip. It is still encased in its original Thermal Conduction Module.Chip looks similar to this. http://www-03.ibm.com/ibm/history/exhibits/vintage/vintage_4506VV3121.html The IBM 3084 mainframe is this: http://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_PP3084.html As a collectable I think the Thermal Conduction Module is much rarer than the 4" chip. IBM classifies it as one of their most important developments. The chips were saved or scrapped for their very high gold content. The thermal modules were copper based with aluminum plungers and quickly sent to scrap. http://www-03.ibm.com/ibm/history/exhibits/vintage/vintage_4506VV2137.html Here is some information on the development of the Thermal Conduction Module. http://www-03.ibm.com/ibm/history/exhibits/mainframe/mainframe_intro3.html This is a thermal Conduction Module that has never been opened. From reading it is filled with helium so I have decided not to crack it unless I absolutely have to for pictures. It came from a IBM 3084 we scrapped in 1993 or 94. The chip inside is similar to one I sold on ebay last month, pictures in the ebay listing would be similar to the chip inside this module. http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=8727630848 Asking $1200 domestic shipping included. Always open to offers. Paxton -- Paxton Hoag Astoria, OR USA