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Screensize: 640 x 480 800 x 600 1024 x 768 1280 x 1024 UserName: Password: Format Mode: Basic  Help  Prompt  Format: Font Andale Mono Arial Arial Black Book Antiqua Century Gothic Comic Sans MS Courier New Georgia Impact Lucida Console Script MT Bold Stencil Tahoma Times New Roman Trebuchet MS Verdana   Size 1 2 3 4 5 6   Color Black Red Yellow Pink Green Orange Purple Blue Beige Brown Teal Navy Maroon LimeGreen Message: * HTML is OFF * Forum Code is ON Smilies [quote][i]Originally posted by miniman82[/i] [br]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. [b]Image Insert:[/b][br][img]http://www.mcumall.com/forum/uploaded/miniman82/201483094153_burn test.JPG[/img][br][size=1] 63.96 KB[/size=1] 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. [/quote]    Insert an Image File Check here to include your profile signature.