If you wish to use copyrighted material from this site for purposes of your own that go beyond fair use, you must obtain permission directly from the copyright owner. Section 107, the material on this site is distributed without profit to those who have expressed a prior interest in receiving the included information for research and educational purposes. We believe this constitutes a fair use of any such copyrighted material as provided for in section 107 of the US Copyright Law. We make such material available in an effort to advance awareness and understanding of the issues involved. This site contains copyrighted material the use of which has not always been specifically authorized by the copyright owner. And of course the obvious is to double check the location of the notch on the chip (label orientation can trick you sometimes).All the same will not read right it has all 00 or 80 on all lines.One of the things that varies between manufacturers is whether the VPP pin needs to be pulled high, pulled low or left floating to read the EPROM, and. ZIF sockets on the EPROM programmers contact the sides of the legs. Single wipe sockets contact the inside or outside surface of the chip legs.ĭouble wipe sockets contact the inside AND outside surface of the chip legs. It will then get read twice, once with VPP low and again with VPP high, and one of the halves should show good data.
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