MCUmall EPROM BIOS Chip Burner Forum
MCUmall EPROM BIOS Chip Burner Forum
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 Automobile engine ECU, Immo, Air bag chip tunning
 How to read copy protected M27c256b?
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passuff

7 Posts

Posted - 11/11/2010 :  12:53:31  Show Profile  Reply with Quote
Hello!

I have a 27C256B with a copy protection socket. From what I read in other forums, this eeprom can be read - but its not so easy. If ECU is reading a single adress from EEPROM it switches CS (chipselect) every time. If I want to read with programmer, chipselect is always set tpo on... This is noticed by the little extra IC on the socket and it returns only crap data...
So I need to write a skript for my willem Programmer to switch CS after reading an adress... But I dont know how... someone does?
Reply #1

passuff

7 Posts

Posted - 11/11/2010 :  14:39:22  Show Profile  Reply with Quote
maybe i was wrong... its not CS its OE output enable.
Is there a way to toggle OE after reading a single address?
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Reply #2

ZLM

2928 Posts

Posted - 11/14/2010 :  10:14:49  Show Profile  Reply with Quote
no. That pin is controlled by software automatically.
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