All Forums  MCUmall Forums  Using The Enhanced/Dual power Willem Programmer  Issues erasing and writing to AT29C020

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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 PRL519[/i] [br]I just started using the GQ4x4 programmer. Works great except for a bunch of Atmel 29C020 flash chips I bought on eBay. They were listed as new, but of course they're not. Some questions: 1) A few of the chips have an "unknown" ID. Can that be modified? If so, can the GQ4x4 modify it? Should I still be able to work with the chip if it has an unknown ID? Or does the ID determine how the GQ4x4 programs it? 2) I'm unable to erase or write to [u]any[/u] of my AT29C020 chips. I assume that's because they're locked (I have a dozen of them; it's unlikely they're all bad). I went to the Lock/Unlock option and clicked the Unprotect button in the All Sectors group (the Protect button was greyed out). The log showed: Unprotect .... * Unprotect Ended * Whatever that means. If the Unprotect operation succeeded, shouldn't the Protect button then be enabled and the Unprotect button greyed out? No matter what I tried with Lock/Unlock, I'm still unable to erase or write to any of the chips. 3) How does the speed setting affect writing and erasing? The erase operation is very fast regardless of the speed setting (and the erase still fails). 4) The AT29C020's data sheet shows the write sequence for locking and unlocking the chip. Is there any way to know what the programmer is doing when I click the Unprotect button? Any hints or tips would be appreciated. Thanks. [/quote]    Insert an Image File Check here to include your profile signature.