MCUmall EPROM BIOS Chip Burner Forum
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 True USB Willem Programmer (GQ-2X,3X,4X & GQ-4x4)
 Problem programming 28F020		  New Topic  Reply to Topic
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Diarra Anderson

USA
5 Posts
Posted - 05/14/2010 :  07:47:14  Show Profile  Reply with Quote
I am receiving write errors when programming an Intel 28F020 eprom.
Not all data is bad. Bad addresses seem to be different everytime I try to program. Here is one of the verification messages I receive when programming.

Erasing...
Elapsed time: 3.76 seconds.
Erase completed.
Blank checking... Code
Elapsed time: 1.73 seconds.
Chip is blank
Writing... Code
Elapsed time: 112.63 seconds.
Device write completed OK
Verifying... Code
VerifyFailed, Address=0x000110, Device=0xA2, Buffer=0x00
VerifyFailed
Elapsed time: 105.26 seconds.

Programmer is GQ-4X
H/W Re: GQ-4X Re-1.20
USB Driver Re.2.0
Software Re. 5.02B


Thanks
Edited by - Diarra Anderson on 05/14/2010 07:48:49
Reply #1

ZLM

2945 Posts
Posted - 05/14/2010 :  12:05:06  Show Profile  Reply with Quote
Please try:

http://www.mcumall.com/download/TrueUSBWillem/GQUSBPrgRe5.03Beta.exe
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Reply #2

Diarra Anderson

USA
5 Posts
Posted - 05/14/2010 :  12:35:27  Show Profile  Reply with Quote
Thanks for the quick response. I will try this beta version.
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Reply #3

Diarra Anderson

USA
5 Posts
Posted - 05/14/2010 :  12:41:11  Show Profile  Reply with Quote
It works, Thanks.
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Reply #4

Diarra Anderson

USA
5 Posts
Posted - 05/14/2010 :  13:04:20  Show Profile  Reply with Quote
I have another problem. After the device is programmed, it passes the verification. But if I read the device again the checksum changes. Each time I reread the device chechsum changes.
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Reply #5

ZLM

2945 Posts
Posted - 05/15/2010 :  00:19:41  Show Profile  Reply with Quote
It seems there are some pin contact problems. Wiggling the chip when locking the chip on ZIF, this will help on contact problem.

Once chip passed verification, then the read should be OK. You can try to verify again after write-verification process.
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