MCUmall EPROM BIOS Chip Burner Forum
MCUmall EPROM BIOS Chip Burner Forum
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 True USB Willem Programmer (GQ-2X, GQ-3X, GQ-4X)
 GQ-4X with ADP-019 V4.1 adding FF to Address=0x3FF
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mamejay

3 Posts

Posted - 06/20/2015 :  01:58:22  Show Profile  Reply with Quote
Hey everyone,
Wondering if you can help. I have 4mb files I am writing to 29L3221 SOP chips.
I am finding that I get verify errors on some of my roms but not all.
When I read back the file and compare I am finding that the last bit is changing from value 00 from the original file to FF which is causing the verify failure. The files still work but I would like to know why it is happening.
I am not very good with this stuff so please be kind.
Is there are option in the software to correct this during the write?
Error I am getting is
Verify Failed, Address=0x3FFFFF, Device=0xF8, Buffer=0x00
Reply #1

ZLM

2870 Posts

Posted - 06/21/2015 :  17:50:08  Show Profile  Reply with Quote
It maybe related to chip compatibility. The 2.2K resistor on the adapter may need to be changed.

See:
http://www.mcumall.com/forum/topic.asp?TOPIC_ID=5230

If you have a 1K resistor, you can try to change the 2.2K resistor to 1K.
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