MCUmall EPROM BIOS Chip Burner Forum
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 ST M27C256B not reading in TL866II?
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Calab

Canada
2 Posts

Posted - 07/08/2022 :  14:21:23  Show Profile  Reply with Quote
I recently purchased five ST M27C256B EPROMs on eBay. Now I am trying to use one, but when I try to read it, or verify that it's blank I get a Check ID error.

I am using XGPro v12.05 and a TL866II-Plus v 04.02.129 EPROM burner on a Windows 11 PC. This combination has worked before, but I've recently wiped my system and did a fresh installation of Windows and XGPro.

I have selected the correct chip in the software. The chip is in the socket correctly. Device manager in Windows looks OK.

When I try to read or blank check the chip, the ID that I see is 0x0800. If I skip the ID check and do a read, the chip is full of "F8".

I do have a second chip in my EPROM eraser, but I don't think that it's going to help.

Is it possible that the XGPro software is damaged, or the EPROM burner itself is not working correctly? Is there anything I can do the check this?
Reply #1

anniel

2529 Posts

Posted - 07/09/2022 :  06:20:22  Show Profile  Reply with Quote
quote:
Originally posted by Calab

I recently purchased five ST M27C256B EPROMs on eBay. Now I am trying to use one, but when I try to read it, or verify that it's blank I get a Check ID error.

I am using XGPro v12.05 and a TL866II-Plus v 04.02.129 EPROM burner on a Windows 11 PC. This combination has worked before, but I've recently wiped my system and did a fresh installation of Windows and XGPro.

I have selected the correct chip in the software. The chip is in the socket correctly. Device manager in Windows looks OK.

When I try to read or blank check the chip, the ID that I see is 0x0800. If I skip the ID check and do a read, the chip is full of "F8".

I do have a second chip in my EPROM eraser, but I don't think that it's going to help.

Is it possible that the XGPro software is damaged, or the EPROM burner itself is not working correctly? Is there anything I can do the check this?

Ask the manufacturer, they certainly can help you.
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Reply #2

Calab

Canada
2 Posts

Posted - 07/10/2022 :  09:01:18  Show Profile  Reply with Quote
Just to follow up...

I did some testing on these chips, and others that I have and have determined that my EPROM burners are working properly. I just received "fake" EPROMs.

I was able to burn a M27512 for my purposes.
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Reply #3

anniel

2529 Posts

Posted - 07/10/2022 :  14:55:24  Show Profile  Reply with Quote
quote:
Originally posted by Calab

Just to follow up...

I did some testing on these chips, and others that I have and have determined that my EPROM burners are working properly. I just received "fake" EPROMs.

I was able to burn a M27512 for my purposes.

Fakes are common since they are long time obsolete chips.
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