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Type: Posts; User: 32v_dohc

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    Re: Disassembling an obd1 bin

    how would you seperate the code from the cal? since some code looks an awful lot like a 2d table? I assume there is no easy way? Or is every ldx a table?

    Code can only be accessed by vector...
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    Re: Disassembling an obd1 bin

    I am including the data stream which I copied from ECMGUY's 8D hack:

    L88C4: FDB $0000 ; NXT MSG ENTRY ADDER
    ;
    FCB $F4 ; DEVICE ID
    ;
    FCB $80 ; MEM FLAG, OUTPUT IS ROM TBL
    FCB 64 ; NUM BYTE TO...
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    Re: Disassembling an obd1 bin

    Looking at L88C4 we find(I already counted to the correct place and formated the data):

    L88C4 db $F4
    db $80
    db $40
    dw $014E
    dw $014E
    dw $8000
    dw $8001
    dw $0004
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    Re: Disassembling an obd1 bin

    Sorry so long....

    Ok. So now you have taken your bin and completely disassembled it going through all of the non-disassembled parts and checking that each is cal and not code. What you end up...
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    Re: DIS question..

    For the early stuff like my northstar, the ICM decodes the signal and the pcm recieves a signal similiar to what the ICM of a distributor would put out. For the northstar specifically the engine has...
  6. Re: What do you think about privacy on this board?

    I think hiding E-mails is important to some. I don't think it so much allows people to hide who they are but actually allows participants to answer questions posed to the group(not limiting who can...
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    Disassembling an obd1 bin

    To disassemble a hc11 bin file you must first get a disassembler.

    There are two kinds you can get. The first is a straight disassembler. This kind looks at the next byte determines the op...
  8. Thread: Vector count

    by 32v_dohc
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    Re: Vector count

    Part of the mystery is knowing what chip. The hc11 has vectors from FFC0 to FFFF. In your case the program is filled until FFEF. This would indicate a P4 computer. The vectors are the eight words...
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    Re: What is your project car?

    They're all projects ;)

    I'm currently working on making my 93 eldorado more drivable with more power. I also have an 88 monte carlo SS that I have intention of experimenting with the CCC carb to...
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    Re: Table locations

    So I checked out programming 101 that Bruce Plecan has posted.. and heres where I get confused.
    Take the spark table - Bruce has it at 0x035-0x106.

    The chip used in that ECM was 000 to FFF and...
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    Re: LT1 OBD2 hardware???

    ftp://ftp.diy-efi.org/incoming/

    John
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    Re: LT1 OBD2 hardware???

    Not sure what the F1 variant is.

    The 68hc11 is the generic chip. For different requirements of ram, EEPROM, and output type stuff there are different packages. The F1 is one of those packages. If...
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    Sticky: Re: Introduce yourselves here..

    Hello everyone. My name is John. I am currently Hacking the 93-95 northstar PCM. I am one of those curious guys that always has to have little projects. I want to know how things work and why things...
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    Re: 16134847... anybody hacked it yet?

    Don't know of anyone yet. Doesn't mean its not out there.

    Ludis' site shows it to be EEPROM. Once you get it out maybe I can help you with a few hacking trick

    John
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    Re: L99 S-10 transplant

    You can use an analog volt meter to check for injector fire.(or a niod lite) If the injectors are firing then VATS is not your problem. If the injector drivers are not switching ground then It is...
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    Re: LT1 OBD2 hardware???

    The processor is a MC68HC11F1 variant. Search for 16202476 on google and it will lead you to Tom Hussey's DIY post about the 97 PCM.

    HTH

    John

    I am adding a link
    ...
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    Re: Is there any OBD-I interest?

    good deal.. how early of northstar??

    Mine is a 93. The 93-95 northstars all use the same computer(service numbers are upgrades) and same basic program.

    John
  18. Thread: A Question..

    by 32v_dohc
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    Re: A Question..

    As far as user input goes I beleive that the board and what is available should be widely spread. One of the things I see most with people making money off of the "Chipping" trade is that most do not...
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    Re: Is there any OBD-I interest?

    Hi

    I have interest in the obd1 section. I am currently working on the early northstar stuff. I am interested in finding out what all makes it work. I have quite a bit done but with 2 512K chips I...
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