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27128/2764 EPROM programming


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I have a vp-280 EPROM programmer. I am currently building a Commodore 64 diagnostic cart. I was going to burn a 27128 eprom with the diagnostic program repeated, however my programmer now refuses to successfully program 27128 EPROMs despite it working previously. It still works for other chips. I have tried many new 27128s I have had for a while.

 

So a couple of questions:

 

Has anybody with a vp280 experienced this before, and if so did they fix it?

 

Or

 

Can anybody program a 2764 or 27128 for me? Happy to chuck a few bucks for chip/ post.

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I've got the vp390... It doesn't have any issues with 2764s or 27128s except the old Mitsubishi 2764s with the raised window section - it doesn't want to program those. Let me know if you need help with burning any.
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