MCUmall EPROM BIOS Chip Burner Forum
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 Can't erase or write an AM29F200AB chip		  New Topic  Reply to Topic
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gobble

5 Posts
Posted - 03/13/2010 :  12:11:52  Show Profile  Reply with Quote
I'm using a PSOP44 adapter for the AM29F200AB chip. I can read it but can't erase or write to the chip. I belive I have all the jumpers set correctly. Any ideas or hints?
Reply #1

ZLM

2937 Posts
Posted - 03/13/2010 :  21:43:00  Show Profile  Reply with Quote
The chip may be protected.
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Reply #2

gobble

5 Posts
Posted - 03/14/2010 :  06:23:06  Show Profile  Reply with Quote
It's a brand new blank chip. Is it possible that it could be protected?

This is the exact chip:
h**p://store.americanmicrosemiconductor.com/scriptm29f200ab-90si.html

I can erase and write a 93C46 chip no problem.
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Reply #3

ZLM

2937 Posts
Posted - 03/24/2010 :  20:50:51  Show Profile  Reply with Quote
Most likely the new chip not be protected.
If this happend on new chips, then check the adapter contact to programmer.

You can lock the adapter on ZIF and then push the adapter little bit in ZIF, this will help to reduce the contact problem.

You should be able to get the ID correctly.
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