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 27C256 on PCB50B: Write Error Every time. Help
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metro_eletro

Canada
12 Posts

Posted - 05/04/2021 :  08:15:31  Show Profile  Reply with Quote
Hello,

I'm trying to write to a 27C256 but I get this error every time:

Error at 0x000000 Chip = 0x00 Buffer = 0x16

Sometimes the buffer values change a bit but this error occurs right away as I try to burn. These are new AMD ICs. I've tried several (and have erased any ones that I tested for this). I don't know Willem well enough to know what I'm doing wrong.

- WinXP build with dedicated parallel port
- I have the Willem PCB50B powered by a 9VDC instead of USB for this
- The jumpers are set to what's shown on the graphic in Willem Software.
- I have looked at the guide on this web site and it doesn't add any information

What am I doing wrong? I have only successfully read chips. I have not successfully burned anything.

Really need help. I can't tell if something is faulty or what.

Thank you!

Edited by - metro_eletro on 05/05/2021 07:09:35
Reply #1

anniel

2565 Posts

Posted - 06/22/2021 :  06:16:43  Show Profile  Reply with Quote
quote:
Originally posted by metro_eletro

Hello,

I'm trying to write to a 27C256 but I get this error every time:

Error at 0x000000 Chip = 0x00 Buffer = 0x16

Sometimes the buffer values change a bit but this error occurs right away as I try to burn. These are new AMD ICs. I've tried several (and have erased any ones that I tested for this). I don't know Willem well enough to know what I'm doing wrong.

- WinXP build with dedicated parallel port
- I have the Willem PCB50B powered by a 9VDC instead of USB for this
- The jumpers are set to what's shown on the graphic in Willem Software.
- I have looked at the guide on this web site and it doesn't add any information

What am I doing wrong? I have only successfully read chips. I have not successfully burned anything.

Really need help. I can't tell if something is faulty or what.

Thank you!




Wher did you get new 27C256?
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Reply #2

metro_eletro

Canada
12 Posts

Posted - 06/22/2021 :  11:30:29  Show Profile  Reply with Quote
Hey thank you for responding!

These were Ebay, a set of 15. I've done what I believe is a fair check in terms of making sure they are not fake. I currently believe that they are legitimate.
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Reply #3

anniel

2565 Posts

Posted - 06/24/2021 :  11:36:24  Show Profile  Reply with Quote
quote:
Originally posted by metro_eletro

Hey thank you for responding!

These were Ebay, a set of 15. I've done what I believe is a fair check in terms of making sure they are not fake. I currently believe that they are legitimate.



You visually compared the dies and looked up the date codes? ID comes back correct?
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Reply #4

metro_eletro

Canada
12 Posts

Posted - 07/29/2021 :  06:47:51  Show Profile  Reply with Quote
quote:
Originally posted by anniel
You visually compared the dies and looked up the date codes? ID comes back correct?



No, actually I haven't. I didn't know that was possible to do easily. That would be fantastic. Where can I do this?
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Reply #5

anniel

2565 Posts

Posted - 07/29/2021 :  09:41:21  Show Profile  Reply with Quote
quote:
Originally posted by metro_eletro

quote:
Originally posted by anniel
You visually compared the dies and looked up the date codes? ID comes back correct?



No, actually I haven't. I didn't know that was possible to do easily. That would be fantastic. Where can I do this?



Start with the datasheet.
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