MCUmall EPROM BIOS Chip Burner Forum
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 Open Source Project Willem Programmer Hardware
 27C512 Problem
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miniman82

1 Posts

Posted - 08/30/2014 :  08:43:36  Show Profile  Reply with Quote
I am having a problem with my programmer, PCB3. I am able to read and verify blank 27C512 eproms, but any time I try to write data I get the error shown below.

Image Insert:

63.96 KB

It will not verify and when I read the chip again, it's just a mess or unintelligible garble that bears no resemblance to the original bin file. What am I doing wrong? I have followed all the instruction, and believe I have the jumpers set up correctly along with correct dip switch positions. I am providing power from a 12v wall wart.
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