MCUmall EPROM BIOS Chip Burner Forum
MCUmall EPROM BIOS Chip Burner Forum
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wolfievtec

3 Posts
Posted - 02/28/2013 :  15:29:36  Show Profile
Today I got the GQ-4X Programmer. I have a good data chip (AM27C020) that I need to copy. I placed the chip in the burner (selected my chip), and did a chip read. Then I saved the data as a .BIN file. I then put in my new chip (selected my chip)and did a blank check - (OK). I then did a write. It wrote and verified but when I try it in my motherboard I get nothing. What am I missing? I've tried writing to several chips and the same thing happens. All pass the blank chip test before burning.
Reply #1

ZLM

2945 Posts
Posted - 02/28/2013 :  21:51:07  Show Profile
Are you sure your original chip is working?

I think the data is not read correctly. Make multiple read and make sure all checksums are the same, then save it.

Also, try to use slowest speed and/or an external power if the original chip is a old chip.
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Reply #2

wolfievtec

3 Posts
Posted - 03/03/2013 :  07:09:49  Show Profile
When I read my original chip I get a good checksum. When I put in the blank chip and change the device type, the checksum changes and I get a bad burn. I was able to get 2 good burns out of about 12 chips. What might be the problem with the bad checksums?
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Reply #3

ZLM

2945 Posts
Posted - 03/06/2013 :  20:16:38  Show Profile
If you known the good checksum, then the programmed chip must be same checksum.

Select the device type and then read the orginal chip.
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