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 Can't read some (original) ROMs (2764)

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Archange427 Posted - 05/08/2011 : 08:04:06
Hi

I recently purchased a GQ-4X to burn EPROM for APPLE IIe.
I can write without problem "2764", EPROMs are working in the APPLE (so pinouts are OK and compatible with original chips I guess).
But I can't read the corresponding original ROMS with the GQ-4X.
I got full of "FF" for all the memory readed...
Nevertheless I can read Original ROMs corresponding to 2732 and even 27128. But none with 2764...
I can re-read my own burned EPROM 2764 without problem.
Is it normal that ROMS fully compatibles with 2764 are not necessarily readable with the GQ-4X ?
I am a novice in the burning so sorry if the questions are stupid...
I hope you can help me !
Best Regards

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