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How to determine which EPROM chip I have in my guage cluster

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I want to change the cluster in my 99 986 tip to a comparable 996 type cluster. I already have an "early style" cluster from a 996 cabrio tip car. I have an eprom programmer and am trying to read the eprom off the 996 cluster. How can i determine which eprom chip i have so i can read it with the programmer? everything i have read says the chip is a 93c56 but there are many of these types of chips from various manufacturers. Also, when I select a 93c56 from the selection and "Read" is says read successful but the file data does not show the data on the chip. so it seems to read the chip but doesnt display the data.  I have a minipro TL866A eprom programmer using a laptop that is windows 7.

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I've seen some folks on Boxa.net indicate that they have had problems reading the chip when they used certain programmers other than the GQ-4X.  You can read about it here: http://www.boxa.net/forum/index.php?showtopic=62435


It has been a long time since I did this, but I remember that I had to swap the bits that I read from the chip.


I have attached the full instructions.

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