MCUmall EPROM BIOS Chip Burner Forum
MCUmall EPROM BIOS Chip Burner Forum
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ozzy25

3 Posts
Posted - 03/13/2006 :  16:56:56  Show Profile  Reply with Quote
I am having trouble reading a 27128 chip from a Nissan ECU. I have the Enhanced Willem programmer. Everytime I read the chip the data is different. Looking at certain parts of the data, some of it is correct or mostly correct and other times completely wrong. When I try to do the verify it always gives me an error quickly. I desoldered the chip out of the ECU as best I could, maybe this chip got damaged? Or am I doing something wrong? Thanks.
Reply #1

ZLM

2937 Posts
Posted - 03/13/2006 :  20:44:18  Show Profile  Reply with Quote
The Enhanced willem does not work for most of 27128.

see

http://www.mcumall.com/forum/topic.asp?TOPIC_ID=16
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Reply #2

ozzy25

3 Posts
Posted - 03/13/2006 :  21:31:10  Show Profile  Reply with Quote
I will mainly be flashing an AT29C256. I only need to read the 27128 chip once, is it at all possible?
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Reply #3

ZLM

2937 Posts
Posted - 03/14/2006 :  21:16:10  Show Profile  Reply with Quote
Yes, it is possible. I think you need to route the power source by a wire.
Edited by - ZLM on 03/14/2006 21:17:06
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Reply #4

ozzy25

3 Posts
Posted - 03/15/2006 :  09:08:52  Show Profile  Reply with Quote
Does anyone know what wires I need to cross to read this chip?
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Reply #5

ZLM

2937 Posts
Posted - 03/15/2006 :  21:39:19  Show Profile  Reply with Quote
The 27128 is a 28 pin DIP chip. The Vcc pin is on pin 28. So, cross the pin 28 and ZIF 32. see if this works.
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