MCUmall EPROM BIOS Chip Burner Forum
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 GQ-4X - can't program 27C801		  New Topic  Reply to Topic
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Gr0over

5 Posts
Posted - 12/20/2011 :  09:30:54  Show Profile  Reply with Quote
Hello,

GQ-4X rev 1.10
Win 7 x64, USB driver 2.01
Software 6.13
Voltage checks are all OK.

I have a 98% failure rate with writing ST 27C801 eproms... which are the ones I need to program the most. I could burn a few ones successfully but most of the time it fails.

I have tried 2 different computers, with or without external power supply, and writing speeds –1,0,1,2. They all fail during the write, either at the beginning or later. VPP blinking slows down and down, and poof! write error.

I gave 2 of these chips to a friend who has a professionnal programmer, he had no problem so the chips are fine.

I'm a bit stuck.

Thanks.
Programmer: GQ-4X
Edited by - Gr0over on 12/20/2011 09:31:15
Reply #1

Gr0over

5 Posts
Posted - 12/20/2011 :  14:05:16  Show Profile  Reply with Quote

Image Insert:

15.69 KB

Of course blank checking done before and OK.
Programmer: GQ-4X
Edited by - Gr0over on 12/20/2011 14:05:55
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Reply #2

ZLM

2945 Posts
Posted - 12/21/2011 :  08:32:01  Show Profile  Reply with Quote
It seems there is a compatibility issue.
In is case need testing chips to find out why and possible fix in software.
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