First off, excuse my ignorance! I am going to sell PowerPC 7100/66 and 8100/100 and was told to wipe the computers beforehand by reinstalling the OS. They run 8.1 and 9.0, respectively. Unfortunately, I dont have the software and Im now at the mercy of Ebay. At the moment, later versions of the operating systems are available. Is it necessary or desirable to buyers that I install the original OS that was on the computer or can I use another version? In other words, does the computers OS affect the appeal of that specific PowerPC model? If possible, I would like to purchase just one OS and install it on both computers. Also, does reinstalling a different version of the OS affect the efficacy of deleting personal data (sole intention)? Thanks in advance for your help.