All Forums  MCUmall Forums  True USB Willem Programmer (GQ-2X,3X,4X & GQ-4x4)  GQ-4X - can't program 27C801

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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 Gr0over[/i] [br]Hello, GQ-4X rev 1.10 Win 7 x64, USB driver 2.01 Software 6.13 Voltage checks are all OK. I have a 98% failure rate with writing ST 27C801 eproms... which are the ones I need to program the most. I could burn a few ones successfully but most of the time it fails. I have tried 2 different computers, with or without external power supply, and writing speeds –1,0,1,2. They all fail during the write, either at the beginning or later. VPP blinking slows down and down, and poof! write error. I gave 2 of these chips to a friend who has a professionnal programmer, he had no problem so the chips are fine. I'm a bit stuck. Thanks. [/quote]    Insert an Image File Check here to include your profile signature.