MCUmall EPROM BIOS Chip Burner Forum
MCUmall EPROM BIOS Chip Burner Forum
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 True USB Willem Programmer (GQ-2X,3X,4X & GQ-4x4)
 GQ-4X reading 24c256l
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NovaSec

United Kingdom
27 Posts

Posted - 09/22/2014 :  09:49:50  Show Profile  Reply with Quote
Is there a way to protect the code on a 24C256L, read loads of these in the past but had a couple now that i cant read in circuit, could the circuit be a problem ? or can it be protected ?
Reply #1

ZLM

2937 Posts

Posted - 09/22/2014 :  17:47:35  Show Profile  Reply with Quote
check you 24C256L chip address pins. The software can change the address by click the CFG button.
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Reply #2

NovaSec

United Kingdom
27 Posts

Posted - 09/24/2014 :  09:59:53  Show Profile  Reply with Quote
Thanks, tried another chip from a different panel today and the same. Just looked at CFG button and it gives me 3 options will have a read.
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Reply #3

NovaSec

United Kingdom
27 Posts

Posted - 09/24/2014 :  22:18:18  Show Profile  Reply with Quote
Tried CFG and selecting a changing the address still nothing
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Reply #4

NovaSec

United Kingdom
27 Posts

Posted - 09/26/2014 :  06:44:40  Show Profile  Reply with Quote
Tried another today and the same nothing, can anybody help me out on this.
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Reply #5

ZLM

2937 Posts

Posted - 09/26/2014 :  14:52:11  Show Profile  Reply with Quote
If your board CPU controls this chip, then you are unable to read/write the chip while the CPU occupied it. In this case you need to de-solder the chip and program it on the programmer ZIF socket.
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Reply #6

NovaSec

United Kingdom
27 Posts

Posted - 09/27/2014 :  01:26:06  Show Profile  Reply with Quote
I tried a different chip from the same but older panel that has a DIL socket for the eeprom, removed it and tried to read it all blank again.
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Reply #7

NovaSec

United Kingdom
27 Posts

Posted - 09/28/2014 :  06:23:55  Show Profile  Reply with Quote
Just dusted of a old serial programmer, and used IC Prog to read this chips without a problem, can something have gone wrong with my GQ-4X never had issues before.
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Reply #8

ZLM

2937 Posts

Posted - 09/30/2014 :  07:39:38  Show Profile  Reply with Quote
If your chip can be easily removed from the board, then you can just program it on the programmer. That should not have problem.
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Reply #9

NovaSec

United Kingdom
27 Posts

Posted - 09/30/2014 :  11:17:53  Show Profile  Reply with Quote
The last one i tried was socketed DIL so easy removed, tried in GQ-4x nothing then as per post 7

could i have changed something in the software ???
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Reply #10

ZLM

2937 Posts

Posted - 09/30/2014 :  11:53:30  Show Profile  Reply with Quote
In oder to change the sofware, we need to repeat the problem here and know what is the software problem.
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