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True USB Willem Programmer (GQ-2X,3X,4X & GQ-4x4)

AT29C040A and GQ-4X

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jdtoronto

1 Posts

Posted - 07/11/2011 : 04:53:34

The AT29C040A devices I have already have code in them and I need to erase them. I run erase from the GUI and I get the response:

Erasing...
Elapsed time: 0.36 seconds.
Erase completed.

But when I read the device or do a blank check, it still has data in it:

ID check skipped
Blank checking... Code
Elapsed time: 0.15 seconds.
Device blank check failed at address: 0x000000, Read= 0xF3.
Blank check failed

And the data:

F3 ED 38 34 CB 7F 20 61 C3 A8 00 36 34 31 38 30
20 4F 50 20 43 4F 44 45 20 45 52 52 4F 52 0D 0A
00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
00 00 00 00 00 00 00 00 C3 32 08 52 61 6D 20 54
65 73 74 20 46 61 69 6C 20 0D 0A 00 53 65 6C 66
20 54 65 73 74 20 49 6E 20 50 72 6F 67 72 65 73
73 20 0D 0A 00 00 C3 35 08 21 0B 00 18 03 21 3B
00 DD 21 78 00 C3 1C 03 18 FE 50 72 6F 67 72 61
6D 20 43 68 65 63 6B 73 75 6D 20 45 72 72 6F 72
20 0D 0A 50 6C 65 61 73 65 20 72 65 2D 64 6F 77
6E 6C 6F 61 64 0D 0A 00 AF ED 39 36 ED 39 30 ED

So it seems the blank check is working.

How do I unlock the device so I can erase it?

Any body have any clues?
John

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