MCUmall EPROM BIOS Chip Burner Forum
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 True USB Willem Programmer (GQ-2X, GQ-3X, GQ-4X)
 AT29C020 lock/unlock

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T O P I C    R E V I E W
DarkHelmet Posted - 11/25/2018 : 23:10:18
I have a 29C020 which the lower part is locked for writing. I have the GQ-4X with the latest software which says this is a supported part.


I've used the lock dialog to unlock this chip, and it still says it's locked, even trying at the slowest write option.

Has anyone else seen this?
2   L A T E S T    R E P L I E S    (Newest First)
DarkHelmet Posted - 11/26/2018 : 05:44:19
quote:
Originally posted by anniel
The AT27C020 has no provision to be locked nor unlocked much less half of the chip.
You do know this is an OTP device, right?



Sorry, I posted this very late, and I meant to say 29C020. I've updated the subject to reflect this.
anniel Posted - 11/26/2018 : 05:00:39
quote:
Originally posted by DarkHelmet

I have a 27C020 which the lower part is locked for writing. I have the GQ-4X with the latest software which says this is a supported part.


I've used the lock dialog to unlock this chip, and it still says it's locked, even trying at the slowest write option.

Has anyone else seen this?



The AT27C020 has no provision to be locked nor unlocked much less half of the chip.
You do know this is an OTP device, right?

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