MCUmall EPROM BIOS Chip Burner Forum
MCUmall EPROM BIOS Chip Burner Forum
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 Automobile engine ECU, Immo, Air bag chip tunning
 Address lines scrambled
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sabercatpuck

USA
5 Posts

Posted - 12/18/2009 :  07:22:32  Show Profile  Reply with Quote
I am working on dissasembling the ECM for my car (well as junk yard version similar to my car) and found that several of the address lines were swapped (pairs A1-A13, A2-A12, A3-A11, A10-A14). Using a willem 5.0 is there any way to correct this while uploading the program in software or am I looking at needing to build a small conversion board to do it at a hardware level?
Reply #1

sabercatpuck

USA
5 Posts

Posted - 12/18/2009 :  14:55:30  Show Profile  Reply with Quote
Well after several hours of messing around with some floppy cables and plugs I unsoldered from a motherboard I was able to set up a bear skins and bailing wire adaptor and was able to pull the data from the chip. Although if there are any people who know how to do this easier I still would like to know.
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Reply #2

ZLM

2928 Posts

Posted - 12/19/2009 :  22:03:32  Show Profile  Reply with Quote
The simplest way is un-soldering the chip and place the chip in an adapter. and then read it from the programmer.
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Reply #3

sabercatpuck

USA
5 Posts

Posted - 12/24/2009 :  10:12:57  Show Profile  Reply with Quote
I had already unsoldered the chip (and installed a socket). While making a copy of the data is not a problem with the scrambled address lines, trying to dissaemble the code is. It is like putting a piece of mail in a downtown holdout and expecting it to end up in the suburbs, makes it very difficult to get anything out of the disassembly. The adaptor was actually a bunch (32 to be specific) of wires (thin stuff from a piece of network cable) that I soldered on to the ends of a couple ribbon cables and then inserted into a socket with the chip, with the address lines going to where they needed to to get unscrambled data from the chip.
On a side note, when I tried to change a few things and flash it I apparently had a slightly different version of the chip (both 28f010's) that would not flash it, but that problem I have straightened out. I still may need to get a logic analyzer to watch the data flow though. Anyone know a way to tag into the PCI bus? You have 64 high speed data lines available for all your decoding needs if you can get at em. I have seen some on the parallel port, butt they only give you 8 bits which only lets you see the data.
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