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 True USB Willem Programmer (GQ-2X, GQ-3X, GQ-4X)
 [Solved] Read HN27C64G fails
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lionel7474

France
2 Posts

Posted - 06/28/2016 :  20:38:47  Show Profile  Reply with Quote
Good evening,
I have the following system and software (Windows XP SP3):

H/W Re: GQ-4X Re-2.20(SW Re. 6.38)
USB Driver Re.2.0
Software Re. 6.38

<<HN27C64>>
Apply external power !

When reading a few times a HN27C64G, the content (the buffer) and the checksum are always different. The Verify command also fails. This EPROM works well when used in its environment.

When reading a different EPROM with the GQ-4X Re-2.20, it works perfectly.

Is the HN27C64G supported?

Regards,
Lionel

Edited by - lionel7474 on 07/01/2016 13:46:10
Reply #1

ZLM

2934 Posts

Posted - 06/28/2016 :  21:09:41  Show Profile  Reply with Quote
HN27C64G supported.

Check the pin contacting.

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Reply #2

lionel7474

France
2 Posts

Posted - 07/01/2016 :  13:44:58  Show Profile  Reply with Quote
Thank you for the suggestion.

Here is what finally worked:
1. Read the EPROM many times (11 to 19) until the checksum is constant.
2. Now the content can be read perfectly for all EPROMS.
3. When I turn off the GQ-4X, then when I turn it on, I have to go through the above step 1 until the checksum is constant.

I tried it on two PCs (one with Windows XP, one with Windows 10 with a fresh install of the software): the behavior is the same. I wonder if there are capacitors or other components that are aging? I bought the GQ-4X new last summer (2015).

Regards,
Lionel
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