mr chipped uk Q ,what is your copied chip data off for cossies , i have an eprom programmer and my chips turn out ok too,people dont seem to realise that the actual chip is not important ,but it is the data on it that is ,and if copied correctly then the chip is identical to the donor chip .........i use 27c64a chips ,they are reliable p.s if people looked at your feedback on ebay they would see 98 percent of people are happy with your product